Two Coupes, but completely different in all significant aspects: modifications, horsepower, fuel economy, height, model year, starting price, ground shadow size, and maximum occupancy. First of all, the 2016 Alfa Romeo 4C Coupe is priced $6,850 lower compared to the base MSRP of the 2014 Mercedes-Benz C-Class Coupe C63 AMG, which is older by two model years. Also, the 2014 C-Class Coupe C63 AMG has bigger and thirstier engine; the 2016 4C Coupe gets 13 more mpg. In addition, the 4C Coupe is both slightly smaller and significantly shorter than the C-Class Coupe C63 AMG. And then, the Mercedes-Benz C-Class Coupe C63 AMG seats two more passengers than the Alfa Romeo 4C Coupe. Among similarities are the body structure and market segment.