Compare the2025 Cadillac CT4VS 2024 Lexus IS

Both the CT4 and IS have child safety locks to prevent children from opening the rear doors. The CT4 has 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 IS’ 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.

In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the CT4 are reminded to check the back seat if they opened the rear door before starting out. The IS doesn’t offer a back seat reminder.

The CT4’s standard pretensioning seatbelts also sense rear collisions and remove slack from the front seatbelts to help protect the occupants from whiplash and other injuries. The IS doesn’t offer a whiplash protection system.

Both the CT4 and the IS have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee 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, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning, available all wheel drive and around view monitors.

There are over 2 times as many Cadillac dealers as there are Lexus dealers, which makes it much easier should you ever need service under the CT4’s warranty.

A hardened steel chain, with no maintenance needs, drives the camshafts in the CT4’s engine. A rubber cam drive belt that needs periodic replacement drives the IS’ camshafts. If the IS’ belt breaks, the engine could be severely damaged when the pistons hit the opened valves.

The battery on the CT4 is in the trunk, which protects it from hot underhood temperatures that can degrade battery life. By keeping the CT4’s battery 20 to 30 degrees cooler, its life is increased by years. The IS’ battery is in the hot engine compartment.

As tested in Motor Trend the Cadillac CT4 2.7 turbo 4-cylinder is faster than the Lexus IS:

On the EPA test cycle the CT4 gets better mileage than the IS:

An engine control system that can shut down some of the engine’s cylinders helps improve the CT4’s fuel efficiency. The IS doesn’t offer a system that can shut down part of the engine.

In heavy traffic or at stoplights the CT4’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. If the conditions warrant or the driver wishes, the system can be manually disabled at any time for the duration of a trip. The IS doesn’t offer an automatic engine start/stop system.

The CT4 has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The IS doesn’t offer a cap-less fueling system.

A 10-speed automatic is standard on the Cadillac CT4 2.7 turbo 4-cylinder, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the IS.

The CT4 stops shorter than the IS:

The CT4’s optional tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the IS F Sport’s 40 series front tires.

The CT4 has a standard easy tire fill system. When inflating the tires, the vehicle’s integrated tire pressure sensors keep track of the pressure as the tires fill and tell the driver when the tires are inflated to the proper pressure. The IS doesn’t offer vehicle monitored tire inflation.

Having a flat tire is dangerous, inconvenient and expensive. The self-sealing tires available on the CT4 can automatically seal most punctures up to 3/16 of an inch, effectively preventing most flat tires. The IS doesn’t offer self-sealing tires.

The Cadillac CT4 may be more efficient, handle and accelerate better because it weighs about 150 to 300 pounds less than the Lexus IS.

The front grille of the CT4 Premium Luxury uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The IS doesn’t offer active grille shutters.

The CT4 has .1 inches more front headroom, 1.2 inches more rear legroom and .5 inches more rear shoulder room than the IS.

The CT4 has a 1000 lbs. towing capacity. The IS has no towing capacity.

The CT4 Premium Luxury/Sport offers an optional heads-up display that projects speed, tachometer, warning 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 IS doesn’t offer a heads-up display.

The power windows standard on both the CT4 and the IS have locks to prevent small children from operating them. When the lock on the CT4 is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The IS prevents the driver from operating the other windows just as it does the other passengers.

The CT4’s standard Keyless Access allow you to unlock the doors from any outside door handle, open the trunk, and start the engine, all without removing the key from the pocket or purse. Smart Access standard on the IS doesn’t offer a sensor on the rear doors, so you’ll have to reach a front handle to unlock the rear door.

The CT4’s power window, power lock, power mirror and cruise control switches are lit from behind, making them plainly visible and easier to operate at night. The IS’ cruise control switches are unlit, making them difficult to find at night and operate safely.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the CT4 has standard extendable sun visors. The IS doesn’t offer extendable visors.

The CT4 Sport offers optional massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the IS.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Cadillac CT4 has a standard wireless phone charging system (Qi) in the front center console. The IS doesn’t offer wireless personal charging.

Insurance will cost less for the CT4 owner. The Complete Car Cost Guide estimates that insurance for the CT4 will cost $390 to $9880 less than the IS over a five-year period.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Cadillac CT4 will be $3156 to $29103 less than for the Lexus IS.