BMW 8 Series (G14) (2018) is 568 mm (22.36 inch) longer and 92 mm (3.62 inch) wider than Citroen DS4 (2020).
Citroen DS4 (2020) is 187 mm (7.36 inch) higher, 485 kg (1,069 lbs) lighter and has 9 liters (0.32 ft3) bigger cargo space than BMW 8 Series (G14) (2018).