BMW 8 Series (G14) (2019) is 22 mm (0.87 inch) wider than Cadillac CT6 (2020).
Cadillac CT6 (2020) is 384 mm (15.12 inch) longer, 134 mm (5.28 inch) higher, 29 kg (64 lbs) lighter and has 97 liters (3.43 ft3) bigger cargo space than BMW 8 Series (G14) (2019).