Cadillac CT6 (2020) is 681 mm (26.81 inch) longer, 184 mm (7.24 inch) higher and has 97 liters (3.43 ft3) bigger cargo space than Mercedes AMG GT (2018).
Mercedes AMG GT (2018) is 59 mm (2.32 inch) wider and 249 kg (549 lbs) lighter than Cadillac CT6 (2020).