Two Coupes, but completely different in all significant aspects: horsepower, fuel economy, ground shadow size, model year, starting price, height, and maximum occupancy. First of all, there is a $13,700 difference in the base MSRP. The 2014 Audi RS 5 Coupe, an older vehicle by two model years, has a higher starting price than the 2016 Alfa Romeo 4C Coupe. Also, the 2014 RS 5 Coupe has bigger and thirstier engine; the 2016 4C Coupe gets 10 more mpg. In addition, not only 4C Coupe is significantly smaller, but it's also slightly shorter than the RS 5 Coupe. And finally, the Audi RS 5 Coupe seats two more passengers than the Alfa Romeo 4C Coupe. Among similarities are the body structure and market segment.