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For enhanced safety, the front shoulder belts of the Lexus GS Series are height-adjustable, and the rear seat shoulder belts have child comfort guides to move the belt to properly fit children. A better fit can prevent injuries and the increased comfort also encourages children to buckle up. The Porsche Panamera has only front height-adjustable seat belts.
To help make backing safer, the GS Series’ 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 Panamera doesn’t offer a cross-path warning system.
Both the GS Series and the Panamera have standard driver and passenger frontal airbags, front and rear 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 all wheel drive, night vision systems and rear parking sensors.
Lexus’ powertrain warranty covers the GS Series 2 years and 20,000 miles longer than Porsche covers the Panamera. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the Panamera ends after only 4 years or 50,000 miles.
There are over 26 percent more Lexus dealers than there are Porsche dealers, which makes it easier should you ever need service under the GS Series’ warranty.
J.D. Power and Associates rated the GS Series third among midsize premium cars in their 2018 Initial Quality Study. The Panamera isn’t in the top three in its category.
J.D. Power and Associates’ 2018 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Lexus vehicles are more reliable than Porsche vehicles. J.D. Power ranks Lexus first in reliability, above the industry average. With 1 more problems per 100 vehicles, Porsche is ranked second.
From surveys of all its subscribers, Consumer Reports’ December 2018 Auto Issue reports that Lexus vehicles are more reliable than Porsche vehicles. Consumer Reports ranks Lexus first in reliability. Porsche is ranked 11th.
In an emergency stopping situation, many drivers don’t press the brakes with enough force to stop the vehicle in the shortest distance. The GS Series has a standard brake assist system to detect emergency braking situations (by how hard and how quickly the brake pedal is pressed) and then automatically apply maximum braking immediately in order to help prevent a collision. The Panamera doesn’t offer a brake assist feature.
The GS Series has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the Panamera; it requires you to depend on roadside assistance and your vehicle will have to be towed.
For better maneuverability, the GS Series’ turning circle is 4.2 feet tighter than the Panamera’s (34.8 feet vs. 39 feet). The GS Series AWD’s turning circle is 5.3 feet tighter than the Panamera Executive’s (35.4 feet vs. 40.7 feet).
The Lexus GS Series may be more efficient, handle and accelerate better because it weighs about 300 to 1250 pounds less than the Porsche Panamera.
The GS Series is 6.7 inches shorter than the Panamera, making the GS Series easier to handle, maneuver and park in tight spaces.
The design of the Lexus GS Series amounts to more than styling. The GS Series has an aerodynamic coefficient of drag of .27 Cd. That is lower than the Panamera (.28 to .3) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the GS Series get better fuel mileage.
As tested by Car and Driver while at idle, the interior of the GS 350 is quieter than the Panamera Turbo (40 vs. 45 dB).
The GS Series has standard seating for 5 passengers; the Panamera can only carry 4.
The GS Series has a larger trunk than the Panamera with its rear seat up (18.4 vs. 17.6 cubic feet).
A low lift-over trunk design makes loading and unloading the GS Series easier. The GS Series’ trunk lift-over height is 28 inches, while the Panamera’s liftover is 29.7 inches.
With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the GS Series offers cargo security. The Panamera’s hatchback body style and non-lockable remote release defeat cargo security.
The GS Series has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The Panamera doesn’t offer a remote starting system.
The GS Series’ standard easy entry system raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. An easy entry system costs extra on the Panamera.
The GS Series offers an optional heads-up display that projects speed and other key instrumentation readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Panamera doesn’t offer a heads-up display.
If the windows are left open on the GS Series the driver can close them all at the outside door handle. On a hot day the driver can lower the windows at the outside door handle or from a distance using the keyless remote. (This window function must be activated by your Lexus service department.) The driver of the Panamera can only operate the windows from inside the vehicle, with the ignition on.
To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the GS Series has standard extendable sun visors. The Panamera doesn’t offer extendable visors.
Insurance will cost less for the GS Series owner. The Complete Car Cost Guide estimates that insurance for the GS Series will cost $65 to $11130 less than the Panamera over a five-year period.
IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Lexus GS Series will be $34105 to $97083 less than for the Porsche Panamera.
Consumer Reports® recommends the Lexus GS Series, based on reliability, safety and performance.
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