BMW 8 Series (G15) (2020) is 22 mm (0.87 inch) wider than Cadillac CT6 (2016).
Cadillac CT6 (2016) is 339 mm (13.35 inch) longer, 130 mm (5.12 inch) higher, 170 kg (375 lbs) lighter and has 13 liters (0.46 ft3) bigger cargo space than BMW 8 Series (G15) (2020).