BMW 4 Series (2020) is 476 mm (18.74 inch) longer, 72 mm (2.83 inch) wider and has 99 liters (3.50 ft3) bigger cargo space than Mercedes A-Class (2019).
Mercedes A-Class (2019) is 50 mm (1.97 inch) higher and 205 kg (452 lbs) lighter than BMW 4 Series (2020).