BMW 8 Series (G14) (2018) is 88 mm (3.46 inch) longer, 88 mm (3.46 inch) wider and has 47 liters (1.66 ft3) bigger cargo space than Cadillac CT4 (2020).
Cadillac CT4 (2020) is 83 mm (3.27 inch) higher and 353 kg (778 lbs) lighter than BMW 8 Series (G14) (2018).