Acura RDX (2015) is 12 mm (0.47 inch) wider, 208 mm (8.19 inch) higher, 29 kg (64 lbs) lighter and has 299 liters (10.56 ft3) bigger cargo space than Kia Optima Sportswagon (2017).
Kia Optima Sportswagon (2017) is 195 mm (7.68 inch) longer than Acura RDX (2015).