BMW 8 Series (G15) (2018) is 13 mm (0.51 inch) longer and 74 mm (2.91 inch) wider than Peugeot 508 SW (2014).
Peugeot 508 SW (2014) is 146 mm (5.75 inch) higher, 349 kg (769 lbs) lighter and has 110 liters (3.88 ft3) bigger cargo space than BMW 8 Series (G15) (2018).