BMW 8 Series (G14) (2019) is 22 mm (0.87 inch) wider than Cadillac CT6 (2018).
Cadillac CT6 (2018) is 341 mm (13.43 inch) longer, 134 mm (5.28 inch) higher, 260 kg (573 lbs) lighter and has 83 liters (2.93 ft3) bigger cargo space than BMW 8 Series (G14) (2019).