Bentley Mulsanne (2018) is 807 mm (31.77 inch) longer, 74 mm (2.91 inch) wider, 138 mm (5.43 inch) higher and has 3 liters (0.11 ft3) bigger cargo space than BMW 4 Series (2020).
BMW 4 Series (2020) is 1160 kg (2,557 lbs) lighter than Bentley Mulsanne (2018).