BMW 5 Series (2020) is 109 mm (4.29 inch) longer, 139 mm (5.47 inch) higher, 249 kg (549 lbs) lighter and has 180 liters (6.36 ft3) bigger cargo space than BMW 8 Series (G14) (2020).
BMW 8 Series (G14) (2020) is 35 mm (1.38 inch) wider than BMW 5 Series (2020).