BMW 8 Series (G14) (2020) is 505 mm (19.88 inch) longer and 113 mm (4.45 inch) wider than Citroen C4 (2020).
Citroen C4 (2020) is 150 mm (5.91 inch) higher, 653 kg (1,440 lbs) lighter and has 58 liters (2.05 ft3) bigger cargo space than BMW 8 Series (G14) (2020).