As the perennial flagship of Mercedes-Benz, the S-Class cars are built from the ground up to set the standard and presage the brand’s latest advancements. For 2021, they nailed it again. The new S-Class is not only longer, wider & more aerodynamic, it is safer—with rear seat airbags, smarter with second-gen MBUX infotainment tech, and more luxurious than ever. Also noteworthy: the S580 pushes 500 horses.