BMW 5 Series (2020) is 100 mm (3.94 inch) longer, 137 mm (5.39 inch) higher, 140 kg (309 lbs) lighter and has 110 liters (3.88 ft3) bigger cargo space than BMW 8 Series (G15) (2020).
BMW 8 Series (G15) (2020) is 35 mm (1.38 inch) wider than BMW 5 Series (2020).