BMW 8 Series (G14) (2020) is 84 mm (3.31 inch) longer and 82 mm (3.23 inch) wider than Peugeot 408 (2014).
Peugeot 408 (2014) is 149 mm (5.87 inch) higher, 513 kg (1,131 lbs) lighter and has 105 liters (3.71 ft3) bigger cargo space than BMW 8 Series (G14) (2020).