BMW 8 Series (G15) (2018) is 22 mm (0.87 inch) wider than Cadillac CT6 (2018).
Cadillac CT6 (2018) is 341 mm (13.43 inch) longer, 132 mm (5.20 inch) higher, 261 kg (575 lbs) lighter and has 13 liters (0.46 ft3) bigger cargo space than BMW 8 Series (G15) (2018).