A veritable showcase of Cadillac's future stylistic and technical direction, the new CT6 sedan locks horns with the Audi A8, BMW 7 Series and Mercedes-Benz S-Class. That's no easy task, and the American car is counting on a 265-horsepower, 2.0-litre turbo, a 335-horsepower, 3.6-litre V6 or a 404-horsepower, turbocharged mill to get the job done. With this last engine, only all-wheel drive is offered. There's a 10-inch screen atop the middle of the dashboard.