Acura RLX (2020) is 177 mm (6.97 inch) longer and 30 mm (1.18 inch) wider than Kia Optima Sportswagon (2017).
Kia Optima Sportswagon (2017) is 4 mm (0.16 inch) higher, 89 kg (196 lbs) lighter and has 18 liters (0.64 ft3) bigger cargo space than Acura RLX (2020).