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 $242,355 lower compared to the base MSRP of the 2016 Rolls-Royce Ghost Series II. Also, the 2016 Ghost Series II has a more powerful engine than the 2016 CT6, and it gets 8 fewer miles on a gallon of fuel. And finally, not only CT6 is slightly smaller, but it's also shorter than the Ghost Series II. Among similarities are the body structure, market segment, and maximum occupancy.