BMW 8 Series (G15) (2019) is 93 mm (3.66 inch) longer and 82 mm (3.23 inch) wider than Peugeot 408 (2020).
Peugeot 408 (2020) is 147 mm (5.79 inch) higher, 404 kg (891 lbs) lighter and has 35 liters (1.24 ft3) bigger cargo space than BMW 8 Series (G15) (2019).
