Two Sedans with some similarities, but otherwise different in most aspects such as the powertrain, modifications, starting price, horsepower, fuel economy, market segment, height, and maximum occupancy. First of all, the 2017 Mercedes-Benz CLS-Class AMG CLS 63 S has a more powerful engine than the 2017 Acura RLX Hybrid, and it gets 11 fewer miles on a gallon of fuel. Also, the 2017 RLX Hybrid is priced $48,950 lower compared to the base MSRP of the 2017 CLS-Class AMG CLS 63 S. In addition, the roofline of the RLX Hybrid is slightly higher than the CLS-Class AMG CLS 63 S's. And then, the Acura RLX Hybrid seats one more passenger than the Mercedes-Benz CLS-Class AMG CLS 63 S. Among similarities are the body structure, market segment, and ground shadow size.