Two Sedans with some similarities, but otherwise different in most aspects such as the model year, ground shadow size, horsepower, and height. First of all, the 2016 IS 350 produces fewer horsepower than the 2013 MKS. Also, the IS 350 body is significantly smaller than the MKS, and in addition to that, it's also slightly shorter. Among similarities are the body structure, market segment, starting price, fuel economy, and maximum occupancy.