Mercedes M-Class (2015) is 27 mm (1.06 inch) wider, 298 mm (11.73 inch) higher and has 190 liters (6.71 ft3) bigger cargo space than Mercedes S-Class (2015).
Mercedes S-Class (2015) is 441 mm (17.36 inch) longer and 5 kg (11 lbs) lighter than Mercedes M-Class (2015).