Two Sedans with more similarities, such as the body structure, market segment, starting price, height, and maximum occupancy, than differences, like the model year, horsepower, fuel economy, and ground shadow size. First of all, there is a difference in model years. The is 2 years newer. Also, the 2016 Genesis has bigger and thirstier engine; the 2014 IS 350 gets 1.9 more mpg. And finally, the Genesis has a slightly larger body than the IS 350. Among similarities are the body structure, market segment, starting price, height, and maximum occupancy.