BMW 7 Series (2020) is 316 mm (12.44 inch) longer and 135 kg (298 lbs) lighter than Mercedes M-Class (2015).
Mercedes M-Class (2015) is 24 mm (0.94 inch) wider, 321 mm (12.64 inch) higher and has 175 liters (6.18 ft3) bigger cargo space than BMW 7 Series (2020).