Buick Regal Sportback (2018) is 45 mm (1.77 inch) longer, 2 mm (0.08 inch) wider and has 30 liters (1.06 ft3) bigger cargo space than Kia Optima Sportswagon (2017).
Kia Optima Sportswagon (2017) is 15 mm (0.59 inch) higher and 27 kg (60 lbs) lighter than Buick Regal Sportback (2018).
