Two Sedans with more similarities, such as the body structure, market segment, starting price, height, and maximum occupancy, than differences, like the horsepower, fuel economy, and ground shadow size. First of all, the 2015 Volvo S80 has bigger and thirstier engine; the 2016 Mercedes-Benz C-Class gets 1.5 more mpg. And finally, the 2016 C-Class is slightly smaller than the 2015 S80. Among similarities are the body structure, market segment, starting price, height, and maximum occupancy.