BMW 4 Series (2014) is 8 mm (0.31 inch) longer and 47 mm (1.85 inch) wider than Mercedes CLA-Class (2017).
Mercedes CLA-Class (2017) is 76 mm (2.99 inch) higher, 100 kg (220 lbs) lighter and has 25 liters (0.88 ft3) bigger cargo space than BMW 4 Series (2014).