2020 Infiniti Q50 vs. 2020 Mercedes A-Class

Detailed Review, Specifications & Comparison

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Safety

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For enhanced safety, the front seat shoulder belts of the Infiniti Q50 are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The Mercedes A-Class doesn’t offer height-adjustable seat belts.

Over 200 people are killed each year when backed over by motor vehicles. The Q50 (except Pure) offers optional Back-up Collision Intervention that uses rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The A-Class doesn’t offer backup collision prevention brakes.

To help make backing safer, the Q50 (except Pure)’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The A-Class doesn’t offer a cross-path warning system.

Both the Q50 and the A-Class have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, 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 and around view monitors.

Warranty

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The Q50 comes with a full 4-year/60,000-mile basic warranty, which covers the entire car and includes 24-hour roadside assistance. The A-Class’ 4-year/50,000-mile basic warranty expires 10,000 miles sooner.

Infiniti’s powertrain warranty covers the Q50 2 years and 20,000 miles longer than Mercedes covers the A-Class. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the A-Class ends after only 4 years or 50,000 miles.

The Q50’s corrosion warranty is 2 years longer than the A-Class’ (7 vs. 5 years).

Reliability

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J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Infiniti vehicles are more reliable than Mercedes vehicles. J.D. Power ranks Infiniti 11th in reliability, above the industry average. With 6 more problems per 100 vehicles, Mercedes is ranked 13th.

From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Infiniti vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Infiniti 8 places higher in reliability than Mercedes.

Engine

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The Q50 3.0t’s standard 3.0 turbo V6 produces 112 more horsepower (300 vs. 188) and 74 lbs.-ft. more torque (295 vs. 221) than the A-Class’ 2.0 turbo 4-cylinder. The Q50 Red Sport 400’s standard 3.0 turbo V6 produces 212 more horsepower (400 vs. 188) and 129 lbs.-ft. more torque (350 vs. 221) than the A-Class’ 2.0 turbo 4-cylinder.

As tested in Consumer Reports the Q50 3.0t is faster than the Mercedes A-Class:

Q50

A-Class

Zero to 30 MPH

2.4 sec

2.9 sec

Zero to 60 MPH

5.7 sec

7.3 sec

45 to 65 MPH Passing

4.2 sec

4.8 sec

Quarter Mile

14.2 sec

15.7 sec

Speed in 1/4 Mile

103 MPH

92 MPH

Fuel Economy and Range

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The Q50 has 6.5 gallons more fuel capacity than the A-Class (20 vs. 13.5 gallons), for longer range between fill-ups.

Brakes and Stopping

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For better stopping power the Q50 Sport/Red Sport 400’s brake rotors are larger than those on the A-Class:

Q50 Sport/Red Sport 400

A-Class

Front Rotors

14 inches

12.6 inches

Rear Rotors

13.8 inches

11.6 inches

The Q50’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the A-Class are solid, not vented.

The Q50 stops shorter than the A-Class:

Q50

A-Class

60 to 0 MPH

126 feet

130 feet

Consumer Reports

60 to 0 MPH (Wet)

131 feet

134 feet

Consumer Reports

Tires and Wheels

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For better traction, the Q50 has larger standard tires than the A-Class (225/55R17 vs. 205/55R17). The Q50 Red Sport 400’s tires are larger than the largest tires available on the A-Class (F:245/40R19 & R:265/35R19 vs. 225/40R19).

The Q50 Red Sport 400’s 265/35R19 rear tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the A-Class’ optional 40 series tires.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the Q50 can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. Run-flat tires aren’t available on some tire packages on the A-Class.

Suspension and Handling

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For a smoother ride and more stable handling, the Q50’s wheelbase is 4.8 inches longer than on the A-Class (112.2 inches vs. 107.4 inches).

Passenger Space

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Because it has more passenger and cargo room, the EPA rates the Q50 a Mid-size car, while the A-Class is rated a Compact.

The Q50 has 8.5 cubic feet more passenger volume than the A-Class (101.5 vs. 93).

The Q50 has 2.7 inches more front legroom, 1.6 inches more front shoulder room, .3 inches more rear headroom, 1.2 inches more rear legroom and 2.1 inches more rear shoulder room than the A-Class.

Cargo Capacity

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The Q50 has a much larger trunk than the A-Class (13.5 vs. 8.6 cubic feet).

With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the Q50 offers cargo security. The A-Class’ non-lockable remote release defeats cargo security.

Servicing Ease

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The engine in the Q50 is mounted longitudinally (North-South), instead of sideways, as in the A-Class. This makes it easier to service and maintain, because the accessory belts are in front.

J.D. Power and Associates surveys of service recipients show that Infiniti service is better than Mercedes. J.D. Power ranks Infiniti fourth in service department satisfaction. With an 8% lower rating, Mercedes is ranked fifth.

Ergonomics

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Consumer Reports rated the Q50’s headlight performance “Good,” a higher rating than the A-Class’ headlights, which were rated “Poor.”

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the Q50 has standard extendable sun visors. The A-Class doesn’t offer extendable visors.

Recommendations

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/07/10

The Infiniti Q50 outsold the Mercedes A-Class by 47% during 2019.

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