BMW 4 Series (2016) is 12 mm (0.47 inch) longer and 60 mm (2.36 inch) wider than Mercedes C-Class (2019).
Mercedes C-Class (2019) is 59 mm (2.32 inch) higher, 140 kg (309 lbs) lighter and has 35 liters (1.24 ft3) bigger cargo space than BMW 4 Series (2016).