Hyundai Sonata (2019) is 45 mm (1.77 inch) longer, 411 kg (906 lbs) lighter and has 42 liters (1.48 ft3) bigger cargo space than Kia Optima Sportswagon (2018).
Kia Optima Sportswagon (2018) is 1 mm (0.04 inch) wider and 25 mm (0.98 inch) higher than Hyundai Sonata (2019).
