BMW 8 Series (G15) (2020) is 568 mm (22.36 inch) longer, 92 mm (3.62 inch) wider and has 61 liters (2.15 ft3) bigger cargo space than Citroen DS4 (2014).
Citroen DS4 (2014) is 185 mm (7.28 inch) higher and 386 kg (851 lbs) lighter than BMW 8 Series (G15) (2020).