BMW 4 Series (2020) is 82 mm (3.23 inch) longer and 42 mm (1.65 inch) wider than Mercedes C-Class (2014).
Mercedes C-Class (2014) is 59 mm (2.32 inch) higher, 155 kg (342 lbs) lighter and has 40 liters (1.41 ft3) bigger cargo space than BMW 4 Series (2020).