Cadillac STS (2018) is 420 mm (16.54 inch) longer, 164 mm (6.46 inch) higher and has 38 liters (1.34 ft3) bigger cargo space than Mercedes AMG GT (2016).
Mercedes AMG GT (2016) is 105 mm (4.13 inch) wider and 114 kg (251 lbs) lighter than Cadillac STS (2018).