Two Sedans with some similarities, but otherwise different in most aspects such as the powertrain, horsepower, fuel economy, and ground shadow size. First of all, the 2016 Lexus GS F has a more powerful engine and gets 9 mpg less than the 2015 Audi A8 Diesel. Also, the 2015 A8 Diesel has a slightly larger body than the 2016 GS F. Among similarities are the body structure, market segment, starting price, and height.