BMW 6 Series Gran Turismo (2020) is 124 mm (4.88 inch) longer, 68 mm (2.68 inch) wider, 86 mm (3.39 inch) higher and has 221 liters (7.80 ft3) bigger cargo space than Cadillac STS (2017).
Cadillac STS (2017) is 36 kg (79 lbs) lighter than BMW 6 Series Gran Turismo (2020).