BMW 8 Series (G14) (2020) is 700 mm (27.56 inch) longer, 85 mm (3.35 inch) wider, 36 mm (1.42 inch) higher and has 15 liters (0.53 ft3) bigger cargo space than Mercedes SLK-Class (2017).
Mercedes SLK-Class (2017) is 478 kg (1,054 lbs) lighter than BMW 8 Series (G14) (2020).