Cadillac XTS (2015) is 754 mm (29.69 inch) longer, 209 mm (8.23 inch) higher and has 324 liters (11.44 ft3) bigger cargo space than Toyota GR Supra (2018).
Toyota GR Supra (2018) is 8 mm (0.31 inch) wider and 188 kg (414 lbs) lighter than Cadillac XTS (2015).