BMW 8 Series (G14) (2018) is 136 mm (5.35 inch) longer and 53 mm (2.09 inch) wider than GMC Terrain (2017).
GMC Terrain (2017) is 345 mm (13.58 inch) higher, 175 kg (386 lbs) lighter and has 1442 liters (50.92 ft3) bigger cargo space than BMW 8 Series (G14) (2018).