Cadillac XTS (2016) is 276 mm (10.87 inch) longer and 31 mm (1.22 inch) higher than Kia Optima Sportswagon (2015).
Kia Optima Sportswagon (2015) is 7 mm (0.28 inch) wider, 267 kg (589 lbs) lighter and has 43 liters (1.52 ft3) bigger cargo space than Cadillac XTS (2016).