BMW 1 Series (2014) is 275 kg (606 lbs) lighter than Mercedes CLS-Class (2014).
Mercedes CLS-Class (2014) is 580 mm (22.83 inch) longer, 134 mm (5.28 inch) wider, 6 mm (0.24 inch) higher and has 160 liters (5.65 ft3) bigger cargo space than BMW 1 Series (2014).