Mercedes-Benz calls this car a four-door coupe and it's competing directly with the Audi A7 Sportback and the BMW 6 Series Gran Coupé. It's based on the E-Class' platform and also borrows its engines. The CLS 550 has a 402-horsepower, twin-turbo V8 and there's also a 577-horsepower AMG CLS 63 S version. Since it's a Mercedes and commands a hefty price, it includes a lot of state-of-the-art technology.