BMW 3 Series Gran Turismo (2019) is 167 mm (6.57 inch) higher, 189 kg (417 lbs) lighter and has 100 liters (3.53 ft3) bigger cargo space than BMW 8 Series (G15) (2018).
BMW 8 Series (G15) (2018) is 19 mm (0.75 inch) longer and 74 mm (2.91 inch) wider than BMW 3 Series Gran Turismo (2019).