GMC Sierra 3500HD (2015) is 455 mm (17.91 inch) longer, 136 mm (5.35 inch) wider, 461 mm (18.15 inch) higher and has 1491 liters (52.65 ft3) bigger cargo space than Mercedes S-Class (2016).
Mercedes S-Class (2016) is 558 kg (1,230 lbs) lighter than GMC Sierra 3500HD (2015).