2019 Porsche Panamera vs. 2019 Cadillac CT6

Detailed Review, Specifications & Comparison

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Both the Panamera and CT6 have child safety locks to prevent children from opening the rear doors. The Panamera offers optional power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The CT6’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.

Both the Panamera and the CT6 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, height-adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available crash mitigating brakes, night vision systems, lane departure warning systems, blind spot warning systems and around view monitors.


The Panamera’s corrosion warranty is 6 years longer than the CT6’s (12 vs. 6 years).


J.D. Power and Associates’ 2018 Initial Quality Study of new car owners surveyed provide the statistics that show that Porsche vehicles are better in initial quality than Cadillac vehicles. J.D. Power ranks Porsche fourth in initial quality, above the industry average. With 11 more problems per 100 vehicles, Cadillac is ranked 12th.

J.D. Power and Associates’ 2018 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Porsche vehicles are more reliable than Cadillac vehicles. J.D. Power ranks Porsche second in reliability, above the industry average. With 86 more problems per 100 vehicles, Cadillac is ranked 27th.

From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Porsche vehicles are more reliable than Cadillac vehicles. Consumer Reports ranks Porsche 17 places higher in reliability than Cadillac.


The Panamera has more powerful engines than the CT6:




Panamera 3.0 turbo V6

330 HP

331 lbs.-ft.

Panamera 4S 2.9 turbo V6

440 HP

405 lbs.-ft.

Panamera GTS 4.0 turbo V8

453 HP

457 lbs.-ft.

Panamera 4 E-Hybrid 2.9 turbo V6

462 HP

516 lbs.-ft.

Panamera Turbo 4.0 turbo V8

550 HP

567 lbs.-ft.

Panamera Turbo S E-Hybrid 4.0 turbo V8

680 HP

626 lbs.-ft.

CT6 2.0 turbo 4 cyl.

265 HP

295 lbs.-ft.

CT6 3.6 DOHC V6

335 HP

285 lbs.-ft.

CT6 3.0 turbo V6

404 HP

400 lbs.-ft.

CT6 V-Sport 4.2 turbo V8

550 HP

627 lbs.-ft.

As tested in Car and Driver the Porsche Panamera turbo V6 is faster than the Cadillac CT6 turbo 4 cyl.:




Zero to 30 MPH

1.8 sec

1.9 sec

Zero to 60 MPH

4.7 sec

6.1 sec

Zero to 80 MPH

7.5 sec

10.8 sec

Zero to 100 MPH

11.6 sec

17.6 sec

5 to 60 MPH Rolling Start

5.5 sec

7 sec

Passing 30 to 50 MPH

3 sec

3.7 sec

Passing 50 to 70 MPH

3.6 sec

4.4 sec

Quarter Mile

13.3 sec

14.7 sec

Speed in 1/4 Mile

107 MPH

92 MPH

Fuel Economy and Range

On the EPA test cycle the Panamera Turbo S E-Hybrid Running on electricity gets better fuel mileage than the CT6 V6 AWD (48 city/51 hwy vs. 18 city/27 hwy).

On the EPA test cycle the Panamera 4S 4 Auto 2.9 twin turbo V6 gets better fuel mileage than the CT6 AWD turbo V6 (21 city/28 hwy vs. 18 city/26 hwy).

The Panamera 4 E-Hybrid can drive on battery power alone for up to 31 miles. The CT6 must run its internal combustion engine to move.

Regenerative brakes improve the Panamera’s fuel efficiency by converting inertia back into energy instead of wasting it. The CT6 doesn’t offer a regenerative braking system.

The Panamera E Hybrid’s standard fuel tank has 1.6 gallons more fuel capacity than the CT6 (21.1 vs. 19.5 gallons), for longer range between fill-ups. The Panamera’s standard fuel tank has 4.2 gallons more fuel capacity than the CT6 (23.7 vs. 19.5 gallons).


The Panamera offers a standard sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The CT6 doesn’t offer an SMG or a conventional manual transmission.

Brakes and Stopping

For better stopping power the Panamera’s brake rotors are larger than those on the CT6:


Panamera Base


CT6 2.0


Front Rotors

13.8 inches

16.5 inches

12.6 inches

13.6 inches

Rear Rotors

13 inches

16.1 inches

12.4 inches

12.4 inches

The Panamera offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The CT6 doesn’t offer ceramic brake rotors.

The Panamera stops much shorter than the CT6:





70 to 0 MPH

153 feet

164 feet

Car and Driver

60 to 0 MPH

101 feet

117 feet

Motor Trend

Tires and Wheels

For better traction, the Panamera has larger standard tires than the CT6 (F:265/45R19 & R:295/40R19 vs. 235/50R18). The Panamera’s optional tires are larger than the largest tires available on the CT6 (F:275/40R20 & R:315/35R20 vs. 245/45R19).

The Panamera’s standard 265/45R19 front and 295/40R19 rear tires provide better handling because they have a lower 45 series front and 40 series rear profile (height to width ratio) that provides a stiffer sidewall than the CT6’s standard 50 series tires. The Panamera’s optional 275/35R21 front and 315/30R21 rear tires have a lower 35 series front and 30 series rear profile than the CT6’s optional 40 series tires.

For better ride, handling and brake cooling the Panamera has standard 19-inch wheels. Smaller 18-inch wheels are standard on the CT6. The Panamera’s optional 21-inch wheels are larger than the 20-inch wheels optional on the CT6.

Suspension and Handling

The Panamera offers active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The CT6 doesn’t offer an active sway bar system.

The Panamera offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Cadillac doesn’t offer an active suspension on the CT6.

The Panamera has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The Panamera’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 CT6 doesn’t offer a load leveling suspension.

For better handling and stability, the average track (width between the wheels) on the Panamera is 2.1 inches wider in the front and .8 inches wider in the rear than the track on the CT6.

The Panamera Turbo handles at 1.00 G’s, while the CT6 pulls only .81 G’s of cornering force in a Car and Driver skidpad test.

The Panamera Turbo executes Motor Trend’s “Figure Eight” maneuver 2.8 seconds quicker than the CT6 (23.9 seconds @ .86 average G’s vs. 26.7 seconds @ .66 average G’s).

For better maneuverability, the Panamera’s turning circle is 1 foot tighter than the CT6’s (39 feet vs. 40 feet).


The Panamera is 7 inches shorter than the CT6, making the Panamera easier to handle, maneuver and park in tight spaces. The Panamera Executive is 1.1 inches shorter than the CT6.

As tested by Car and Driver while at idle, the interior of the Panamera Turbo is quieter than the CT6 AWD (44 vs. 49 dB).

Cargo Capacity

The Panamera has a much larger trunk with its rear seat up than the CT6 (17.6 vs. 15.8 cubic feet).

The Panamera 4dr Hatchback a much larger trunk with its rear seat up than the CT6 (18.3 vs. 15.8 cubic feet).

The Panamera’s available rear seats fold to accommodate long and bulky cargo. The CT6 doesn’t offer folding rear seats, only a ski pass-through.

A standard locking glovebox (which can’t be accessed with the valet key) keeps your small valuables safer in the Panamera. The CT6 doesn’t offer locking storage for small valuables.

Servicing Ease

J.D. Power and Associates surveys of service recipients show that Porsche service is better than Cadillac. J.D. Power ranks Porsche second in service department satisfaction. With a 3% lower rating, Cadillac is ranked third.


To improve rear visibility by keeping the rear window clear, the Panamera offers an optional rear wiper. The CT6 doesn’t offer a rear wiper.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The Panamera offers available headlight washers to keep headlight output high. The CT6 doesn’t offer headlight washers.

The CT6 Premium Luxury/Platinum/Sport’s cornering lamps activate a lamp on the front corner when the turn signal is activated. The Panamera’s optional adaptive cornering lights turn the actual headlight unit up to several degrees, depending on steering wheel angle and vehicle speed. This lights a significant distance into corners at any speed.

Model Availability

The Porsche Panamera comes in four door hatchback and station wagon bodystyles; the Cadillac CT6 isn’t available as a station wagon.

Economic Advantages

The Panamera will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the Panamera will retain 42.42% to 48.11% of its original price after five years, while the CT6 only retains -5.72% to 36.79%.

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

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