GMC Sierra 1500 (2021) is 797 mm (31.38 inch) longer, 228 mm (8.98 inch) wider, 373 mm (14.69 inch) higher and has 1307 liters (46.16 ft3) bigger cargo space than Mercedes GLA-Class (2016).
Mercedes GLA-Class (2016) is 595 kg (1,312 lbs) lighter than GMC Sierra 1500 (2021).