BMW 8 Series (G15) (2018) is 551 mm (21.69 inch) longer, 122 mm (4.80 inch) wider and has 79 liters (2.79 ft3) bigger cargo space than Mercedes A-Class (2020).
Mercedes A-Class (2020) is 92 mm (3.62 inch) higher and 529 kg (1,166 lbs) lighter than BMW 8 Series (G15) (2018).