Cadillac CT6 (2016) is 636 mm (25.04 inch) longer, 182 mm (7.17 inch) higher and has 83 liters (2.93 ft3) bigger cargo space than Mercedes AMG GT (2017).
Mercedes AMG GT (2017) is 59 mm (2.32 inch) wider and 9 kg (20 lbs) lighter than Cadillac CT6 (2016).