BMW 8 Series (G15) (2020) is 568 mm (22.36 inch) longer and 134 mm (5.28 inch) wider than Mazda 6 Atenza (2018).
Mazda 6 Atenza (2018) is 201 mm (7.91 inch) higher, 531 kg (1,171 lbs) lighter and has 101 liters (3.57 ft3) bigger cargo space than BMW 8 Series (G15) (2020).