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 model year, powertrain, horsepower, and fuel economy. First of all, the 2013 Optima Hybrid has a more powerful engine and gets 3 mpg less than the 2016 Sonata Hybrid. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.