BMW 8 Series (G15) (2018) is 200 mm (7.87 inch) longer, 96 mm (3.78 inch) wider and has 39 liters (1.38 ft3) bigger cargo space than Cadillac ATS (2016).
Cadillac ATS (2016) is 79 mm (3.11 inch) higher and 419 kg (924 lbs) lighter than BMW 8 Series (G15) (2018).