BMW 8 Series (G14) (2019) is 551 mm (21.69 inch) longer, 122 mm (4.80 inch) wider and has 9 liters (0.32 ft3) bigger cargo space than Mercedes A-Class (2015).
Mercedes A-Class (2015) is 94 mm (3.70 inch) higher and 528 kg (1,164 lbs) lighter than BMW 8 Series (G14) (2019).