BMW 8 Series (G15) (2019) is 136 mm (5.35 inch) longer and 53 mm (2.09 inch) wider than GMC Terrain (2018).
GMC Terrain (2018) is 343 mm (13.50 inch) higher, 76 kg (168 lbs) lighter and has 1372 liters (48.45 ft3) bigger cargo space than BMW 8 Series (G15) (2019).