GMC Sierra 1500 (2017) is 112 mm (4.41 inch) wider, 48 mm (1.89 inch) higher, 168 kg (370 lbs) lighter and has 568 liters (20.06 ft3) bigger cargo space than Mercedes X-Class (2017).
Mercedes X-Class (2017) is 119 mm (4.69 inch) longer than GMC Sierra 1500 (2017).