BMW 4 Series (2015) is 560 kg (1,235 lbs) lighter than Mercedes S-Class (2017).
Mercedes S-Class (2017) is 547 mm (21.54 inch) longer, 29 mm (1.14 inch) wider, 107 mm (4.21 inch) higher and has 55 liters (1.94 ft3) bigger cargo space than BMW 4 Series (2015).