GMC Sierra 3500HD (2015) is 1285 mm (50.59 inch) longer, 295 mm (11.61 inch) wider, 481 mm (18.94 inch) higher and has 1606 liters (56.72 ft3) bigger cargo space than Subaru Impreza GP (2014).
Subaru Impreza GP (2014) is 1308 kg (2,884 lbs) lighter than GMC Sierra 3500HD (2015).