BMW 1 Series (2015) is 195 mm (7.68 inch) longer, 118 mm (4.65 inch) higher, 75 kg (165 lbs) lighter and has 25 liters (0.88 ft3) bigger cargo space than Mercedes SLK-Class (2020).
Mercedes SLK-Class (2020) is 52 mm (2.05 inch) wider than BMW 1 Series (2015).