BMW 6 Series Gran Turismo (2018) is 447 mm (17.60 inch) longer, 96 mm (3.78 inch) wider, 119 mm (4.69 inch) higher and has 228 liters (8.05 ft3) bigger cargo space than Cadillac ATS (2016).
Cadillac ATS (2016) is 290 kg (639 lbs) lighter than BMW 6 Series Gran Turismo (2018).