BMW 5 Series Gran Turismo (2018) is 100 mm (3.94 inch) longer, 127 mm (5.00 inch) higher, 225 kg (496 lbs) lighter and has 110 liters (3.88 ft3) bigger cargo space than BMW 8 Series (G15) (2018).
BMW 8 Series (G15) (2018) is 35 mm (1.38 inch) wider than BMW 5 Series Gran Turismo (2018).