BMW 8 Series (G15) (2018) is 22 mm (0.87 inch) wider than Cadillac CT6 (2019).
Cadillac CT6 (2019) is 384 mm (15.12 inch) longer, 132 mm (5.20 inch) higher, 116 kg (256 lbs) lighter and has 27 liters (0.95 ft3) bigger cargo space than BMW 8 Series (G15) (2018).