Cadillac CT6

Cadillac's flagship large sedan possesses some athletic chops and is lively to drive. While the ride is firm, the CT6 is steady and controlled, and the interior is very quiet. The base engine is a turbo-four, but most buyers will opt for the midlevel nonturbo V6; the top trim carries a 404-hp, twin-turbocharged V6. All-wheel drive is standard on versions with V6 engines. The interior is plush and roomy, but in-cabin storage is practically nonexistent. Front-seat comfort is superb, but the rear seat is a bit short on thigh support. Despite updates, the Cue infotainment system remains unintuitive and highly distracting to use. A plug-in hybrid version with an estimated 30 miles of EV range is also available. The CT6 offers GM's Super Cruise driver-assistance system, which operates on freeways and monitors the driver to make sure he or she is paying attention.

Cadillac's new flagship fits above the CTS and below the BMW 7 Series and Mercedes-Benz S-Class. But it's priced to compete against the luxury midsized crowd. This large sedan possesses some athletic chops and has a steady, controlled ride and a very quiet interior. Most buyers will opt for the mid-level nonturbo V6, while the top trim carries a 404-hp twin-turbocharged V6. The eight-speed automatic is smooth and responsive. All-wheel drive comes standard with the V6s. The interior is posh and roomy, but cabin storage is a bit scant. Despite improvements, the updated Cue infotainment touch screen is still unintuitive.