2019 Mercedes E-Class Sedan vs. 2019 Infiniti Q50

Detailed Review, Specifications & Comparison

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Safety

For enhanced safety, the front and rear seat shoulder belts of the Mercedes E-Class Sedan have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision. The Infiniti Q50 doesn’t offer pretensioners for the rear seat belts.

The rear seatbelts optional on the E-Class Sedan inflate when a collision is detected, helping to spread crash forces over a much larger area of the body and limiting head and neck movement. This can help prevent spinal and internal injuries. The Q50 doesn’t offer inflatable seatbelts.

The E-Class Sedan’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The Q50 doesn’t offer a driver alert monitor.

Both the E-Class Sedan and the Q50 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available all wheel drive, lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.

For its top level performance in IIHS driver-side small overlap frontal, moderate overlap frontal, side impact, rear impact and roof-crush tests, its standard front crash prevention system, its “Good” rating in the new passenger-side small overlap crash test, and its headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the E-Class Sedan its highest rating: “Top Pick Plus” for 2018, a rating granted to only 28 vehicles tested by the IIHS. The Q50 has not been fully tested, yet.

Warranty

There are over 79 percent more Mercedes dealers than there are Infiniti dealers, which makes it much easier should you ever need service under the E-Class Sedan’s warranty.

Reliability

To reliably power the ignition and other systems and to recharge the battery, the E-Class Sedan has a standard 180-amp alternator. The Q50’s standard 150-amp alternator and largest (Red Sport 400) 170-amp alternator aren’t as powerful.

A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the E-Class Sedan’s reliability 45 points higher than the Q50.

Engine

The E-Class Sedan has more powerful engines than the Q50:

 

Horsepower

Torque

E 300 Sedan 2.0 turbo 4 cyl.

241 HP

273 lbs.-ft.

E 450 4MATIC Sedan 3.0 turbo V6

362 HP

369 lbs.-ft.

AMG E 53 Sedan 3.0 turbo 6 cyl. hybrid

429 HP

384 lbs.-ft.

Q50 2.0t 2.0 turbo 4 cyl.

208 HP

258 lbs.-ft.

Q50 3.0t 3.0 turbo V6

300 HP

295 lbs.-ft.

Q50 Red Sport 400 3.0 turbo V6

400 HP

350 lbs.-ft.

Fuel Economy and Range

On the EPA test cycle the E-Class Sedan gets better fuel mileage than the Q50:

 

 

E-Class

Q50

 

AWD

300/Auto

21 city/29 hwy

18 city/24 hwy

2.0t/Auto

 

450/Auto

20 city/28 hwy

19 city/27 hwy

3.0t/Auto

 

AMG 53/Auto

21 city/28 hwy

19 city/26 hwy

Red Sport 400/Auto

Regenerative brakes improve the E-Class Sedan 53 AMG’s fuel efficiency by converting inertia back into energy instead of wasting it. The Q50 doesn’t offer a regenerative braking system.

Regardless of its engine, the E-Class Sedan’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) Infiniti only offers an automatic engine start/stop system on the Q50 2.0t.

The E-Class Sedan 450/AMG 53’s standard fuel tank has 1.1 gallons more fuel capacity than the Q50 (21.1 vs. 20 gallons).

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes E-Class Sedan higher (5 out of 10) than the Infiniti Q50 (3). This means the E-Class Sedan produces up to 16.5 pounds less smog-producing pollutants than the Q50 every 15,000 miles.

Transmission

A nine-speed automatic is standard on the Mercedes E-Class Sedan, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the Q50.

Brakes and Stopping

For better stopping power the E-Class Sedan’s front brake rotors are larger than those on the Q50:

 

E-Class

AMG E 53

Q50

Q50 Sport

Front Rotors

13.5 inches

14.6 inches

12.6 inches

14 inches

Rear Rotors

11.8 inches

14.2 inches

12.1 inches

13.8 inches

The E-Class Sedan stops much shorter than the Q50:

 

E-Class Sedan

Q50

 

70 to 0 MPH

154 feet

165 feet

Car and Driver

Tires and Wheels

For better traction, the E-Class Sedan has larger standard tires than the Q50 (245/45R18 vs. 225/55R17).

The E-Class Sedan’s standard tires provide better handling because they have a lower 45 series profile (height to width ratio) that provides a stiffer sidewall than the Q50’s standard 55 series tires.

For better ride, handling and brake cooling the E-Class Sedan has standard 18-inch wheels. Smaller 17-inch wheels are standard on the Q50.

Suspension and Handling

The E-Class Sedan has standard front and rear gas-charged shocks for better control over choppy roads. The Q50’s suspension doesn’t offer gas-charged shocks.

The E-Class Sedan has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The E-Class Sedan’s height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The Q50 doesn’t offer a load leveling suspension.

For a smoother ride and more stable handling, the E-Class Sedan’s wheelbase is 3.5 inches longer than on the Q50 (115.7 inches vs. 112.2 inches).

For better handling and stability, the average track (width between the wheels) on the E-Class Sedan is 2.8 inches wider in the front and 1.6 inches wider in the rear than the average track on the Q50.

The E-Class Sedan 4MATIC handles at .92 G’s, while the Q50 Red Sport 400 pulls only .88 G’s of cornering force in a Car and Driver skidpad test.

Passenger Space

The E-Class Sedan has 1.1 inches more front shoulder room, .7 inches more rear headroom, 1.1 inches more rear legroom and 1 inch more rear shoulder room than the Q50.

Cargo Capacity

The E-Class Sedan’s standard rear seats fold to accommodate long and bulky cargo. The Q50 Pure doesn’t offer folding rear seats.

To make loading and unloading groceries and cargo easier when your hands are full, the E-Class Sedan’s power trunk can be opened or closed just by kicking your foot under the back bumper, leaving your hands completely free. The Q50 doesn’t offer a power or hands-free opening trunk.

Servicing Ease

The E-Class Sedan has a maintenance free battery for long life without checking the battery’s water level. The Q50 doesn’t have a maintenance free battery, so the water level in the battery’s cells must be checked often to prevent damage.

Ergonomics

Unlike the driver-only memory system optional at extra cost in the Q50 (except Pure/Luxe), the E-Class Sedan has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The E-Class Sedan’s standard easy entry system raises the steering wheel, making it easier for the driver to get in and out. An easy entry system costs extra on the Q50, and is not available on all models.

The E-Class Sedan offers an optional heads-up display that projects speed and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Q50 doesn’t offer a heads-up display.

The power windows standard on both the E-Class Sedan and the Q50 have locks to prevent small children from operating them. When the lock on the E-Class Sedan is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Q50 prevents the driver from operating the other windows just as it does the other passengers.

Heated windshield washer fluid is standard on the E-Class Sedan to defrost the washer nozzles and quickly clear ice and frost from the windshield without scraping. The Q50 doesn’t offer heated windshield washer fluid.

The Insurance Institute for Highway Safety (IIHS) conducts detailed tests on headlights for their range both straight ahead and in curves and to be certain they don’t exceed acceptable amounts of glare to oncoming drivers. The E-Class Sedan’s headlights were rated “Good” to “Acceptable” by the IIHS, while the Q50’s headlights are rated “Acceptable” to “Marginal.”

To better shield the driver and front passenger’s vision, the E-Class Sedan has standard dual-element sun visors that can block glare from two directions simultaneously. The Q50 doesn’t offer secondary sun visors.

A power rear sunshade is optional in the E-Class Sedan to help block heat and glare for the rear passengers. The Q50 doesn’t offer a rear sunshade.

Optional air-conditioned seats in the E-Class Sedan keep the driver and front passenger comfortable and take the sting out of hot seats in summer. The Q50 doesn’t offer air-conditioned seats.

The E-Class Sedan offers an optional 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The Q50 doesn’t offer a house-current electrical outlet.

The E-Class Sedan’s optional Active Parking Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The Q50 doesn’t offer an automated parking system.

Model Availability

The Mercedes E-Class comes in coupe, convertible, sedan and station wagon bodystyles; the Infiniti Q50 isn’t available as a coupe, convertible or station wagon.

Recommendations

Consumer Reports® recommends the Mercedes E-Class Sedan, based on reliability, safety and performance. The Infiniti Q50 isn't recommended.

The E-Class was chosen as one of Car and Driver’s “Top Ten” in 2018. The Q50 has never been a Car and Driver “Top Ten” pick.

The Mercedes E-Class outsold the Infiniti Q50 by 18% during the 2018 model year.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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