The main difference between the luxury Hyundai Genesis Sedan and the sports version, is that the sports version is in fact a Coupe rather than a Sedan. So the real question is: What is the difference between a Hyundai Genesis Sedan and the Hyundai Genesis Coupe? The main difference between the two cars is that the Coupe is made as a bargain sports car, with none of the finer touches of the luxurious Sedan. Including a generous 3.3 liter engine, fine interior and a smoother sounding engine. However the Hyundai Genesis Coupe does get more miles to the gallon, and the steering is livelier than the Hyundai Genesis Sedan.