BMW 3 Series Gran Turismo (2021) is 170 mm (6.69 inch) higher, 343 kg (756 lbs) lighter and has 171 liters (6.04 ft3) bigger cargo space than BMW 8 Series (G14) (2019).
BMW 8 Series (G14) (2019) is 17 mm (0.67 inch) longer and 73 mm (2.87 inch) wider than BMW 3 Series Gran Turismo (2021).