Acura RDX (2014) is 12 mm (0.47 inch) wider, 208 mm (8.19 inch) higher and has 186 liters (6.57 ft3) bigger cargo space than Kia Optima Sportswagon (2015).
Kia Optima Sportswagon (2015) is 195 mm (7.68 inch) longer and 136 kg (300 lbs) lighter than Acura RDX (2014).