BMW 8 Series (G15) (2020) 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, 161 kg (355 lbs) lighter and has 13 liters (0.46 ft3) bigger cargo space than BMW 8 Series (G15) (2020).