Cadillac CT6 (2017) is 638 mm (25.12 inch) longer, 184 mm (7.24 inch) higher and has 83 liters (2.93 ft3) bigger cargo space than Mercedes AMG GT (2020).
Mercedes AMG GT (2020) is 59 mm (2.32 inch) wider and 9 kg (20 lbs) lighter than Cadillac CT6 (2017).