The front seats are very comfortable, among the best in the class, with ample support, easy entry and exit, and adequate bolstering for slightly spirited driving. The rear seats are tighter, however, with little leg room.
Driving position is at a good height, and highly adjustable for different body types, thanks to a tilt/telescoping steering wheel, power seat adjustments, and the tall, glassy cabin easing visibility. Opting for the C63 AMG will provide seats with just as much comfort, but much more aggressive bolsters that fit more snugly.
Behind the small rear seats is a trunk that's on the smaller end at 12.4 cubic feet in sedans and 11.7 cubic feet in the coupes.
Back in the cabin, a properly American array of cupholders, door pockets, a roomy glove box, and a large center console are present, clad or made of mostly luxury-grade plastics, nice leather, and wood, metal, or other special trims.
Cabin noise is minimal, with wind and road thrum well-controlled. Engine noise can become noticeable under hard acceleration, but settles into the background when cruising.