Two Sedans with more similarities, such as the body structure, market segment, ground shadow size, height, and maximum occupancy, than differences, like the starting price, horsepower, and fuel economy. First of all, the 2016 Cadillac XTS is priced $9,205 lower compared to the base MSRP of the 2015 Kia K900. And finally, the 2015 K900 has a more powerful engine than the 2016 XTS, and it gets 1 fewer mile on a gallon of fuel. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.