Two Sedans with some similarities, but otherwise different in most aspects such as the starting price, horsepower, fuel economy, ground shadow size, and height. First of all, the 2016 Cadillac CT6 is priced $364,330 lower compared to the base MSRP of the 2016 Rolls-Royce Phantom. Also, the 2016 Phantom has bigger and thirstier engine; the 2016 CT6 gets 9 more mpg. And finally, the CT6 body is significantly smaller than the Phantom, and in addition to that, it's also slightly shorter. Among similarities are the body structure, market segment, and maximum occupancy.