BMW 5 Series (2016) is 64 mm (2.52 inch) longer, 122 mm (4.80 inch) higher, 84 kg (185 lbs) lighter and has 140 liters (4.94 ft3) bigger cargo space than BMW 8 Series (G15) (2018).
BMW 8 Series (G15) (2018) is 43 mm (1.69 inch) wider than BMW 5 Series (2016).