BMW 4 Series (2015) is 60 mm (2.36 inch) wider and 10 kg (22 lbs) lighter than Mercedes C-Class (Estate) (2017).
Mercedes C-Class (Estate) (2017) is 4 mm (0.16 inch) longer, 74 mm (2.91 inch) higher and has 45 liters (1.59 ft3) bigger cargo space than BMW 4 Series (2015).