Two Sedans with more similarities, such as the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy, than differences, like the horsepower, fuel economy, model year, and market segment. First of all, the 2014 CTS-V has bigger and thirstier engine; the 2016 GS 450h gets 15 more mpg. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.