Hyundai Sonata (2019) is 45 mm (1.77 inch) longer and 135 kg (298 lbs) lighter than Kia Optima Sportswagon (2015).
Kia Optima Sportswagon (2015) is 1 mm (0.04 inch) wider, 25 mm (0.98 inch) higher and has 71 liters (2.51 ft3) bigger cargo space than Hyundai Sonata (2019).