BMW 4 Series (2015) is 635 kg (1,400 lbs) lighter than Mercedes CL-Class (2014).
Mercedes CL-Class (2014) is 397 mm (15.63 inch) longer, 2 mm (0.08 inch) wider, 34 mm (1.34 inch) higher and has 45 liters (1.59 ft3) bigger cargo space than BMW 4 Series (2015).