GMC Sierra 3500HD (2018) is 604 mm (23.78 inch) longer, 163 mm (6.42 inch) wider, 560 mm (22.05 inch) higher and has 1501 liters (53.01 ft3) bigger cargo space than Mercedes CL-Class (2020).
Mercedes CL-Class (2020) is 495 kg (1,091 lbs) lighter than GMC Sierra 3500HD (2018).