GMC Sierra 3500HD (2020) is 1436 mm (56.54 inch) longer, 137 mm (5.39 inch) wider, 741 mm (29.17 inch) higher and has 1620 liters (57.21 ft3) bigger cargo space than Mercedes AMG GT (2017).
Mercedes AMG GT (2017) is 1124 kg (2,478 lbs) lighter than GMC Sierra 3500HD (2020).