Two Sedans with some similarities, but otherwise different in most aspects such as the model year, ground shadow size, horsepower, fuel economy, and height. First of all, the 2013 MKS has bigger and thirstier engine; the 2016 4 Series Gran Coupe gets 4.5 more mpg. Also, the 4 Series Gran Coupe is both significantly smaller and slightly shorter than the MKS. Among similarities are the body structure, market segment, starting price, and maximum occupancy.