BMW 6 Series Gran Turismo (2020) is 22 mm (0.87 inch) wider, 68 mm (2.68 inch) higher and has 176 liters (6.22 ft3) bigger cargo space than Cadillac CT6 (2016).
Cadillac CT6 (2016) is 92 mm (3.62 inch) longer and 141 kg (311 lbs) lighter than BMW 6 Series Gran Turismo (2020).