GMC Sierra 2500HD (2018) is 605 mm (23.82 inch) longer, 163 mm (6.42 inch) wider, 559 mm (22.01 inch) higher and has 1228 liters (43.37 ft3) bigger cargo space than Mercedes CL-Class (2020).
Mercedes CL-Class (2020) is 384 kg (847 lbs) lighter than GMC Sierra 2500HD (2018).