BMW 5 Series (2015) is 56 mm (2.20 inch) higher, 54 kg (119 lbs) lighter and has 120 liters (4.24 ft3) bigger cargo space than BMW 8 Series (G16) (2019).
BMW 8 Series (G16) (2019) is 175 mm (6.89 inch) longer and 73 mm (2.87 inch) wider than BMW 5 Series (2015).