BMW 8 Series (G14) (2018) is 22 mm (0.87 inch) wider than Cadillac CT6 (2019).
Cadillac CT6 (2019) is 384 mm (15.12 inch) longer, 134 mm (5.28 inch) higher, 115 kg (254 lbs) lighter and has 97 liters (3.43 ft3) bigger cargo space than BMW 8 Series (G14) (2018).