GMC Sierra 3500HD (2014) is 1173 mm (46.18 inch) longer, 142 mm (5.59 inch) wider, 320 mm (12.60 inch) higher and has 1641 liters (57.95 ft3) bigger cargo space than Mercedes GLC-Class (2015).
Mercedes GLC-Class (2015) is 519 kg (1,144 lbs) lighter than GMC Sierra 3500HD (2014).