GMC Sierra 1500 (2020) is 806 mm (31.73 inch) longer, 292 mm (11.50 inch) wider, 397 mm (15.63 inch) higher and has 1343 liters (47.43 ft3) bigger cargo space than Subaru Impreza GP (2016).
Subaru Impreza GP (2016) is 595 kg (1,312 lbs) lighter than GMC Sierra 1500 (2020).