BMW 8 Series (G15) (2018) is 709 mm (27.91 inch) longer, 85 mm (3.35 inch) wider, 38 mm (1.50 inch) higher and has 85 liters (3.00 ft3) bigger cargo space than Mercedes SLK-Class (2017).
Mercedes SLK-Class (2017) is 469 kg (1,034 lbs) lighter than BMW 8 Series (G15) (2018).