The primary difference between the 2015 Mercedes-Benz S550 and the S550 Coupe is that the S550 is a four-door sedan rather than a two-door car. The S550 Coupe is also slightly shorter and lighter than a comparable S550 sedan and comes standard with the 4MATIC four-wheel drive system.
The S550 sedan with 4MATIC four-wheel drive has a curb weight of 4,773 pounds, slightly heavier than the S550 Coupe's curb weight of 4,707 pounds. However, a real-wheel drive S550 sedan is actually lighter than the coupe due to the omission of the four-wheel drive system. The S-class coupe and sedan are similar in most other respects, including the standard 4.7-liter V8 engine that produces 449 horsepower for both versions of the car.