BMW 4 Series (2013) is 504 mm (19.84 inch) longer, 8 mm (0.31 inch) wider, 59 mm (2.32 inch) higher and has 110 liters (3.88 ft3) bigger cargo space than Mercedes SLK-Class (2017).
Mercedes SLK-Class (2017) is 130 kg (287 lbs) lighter than BMW 4 Series (2013).