Kia Optima Sportswagon (2017) is 15 mm (0.59 inch) higher than Opel Insignia Grand Sport (2017).
Opel Insignia Grand Sport (2017) is 42 mm (1.65 inch) longer, 3 mm (0.12 inch) wider, 350 kg (772 lbs) lighter and has 50 liters (1.77 ft3) bigger cargo space than Kia Optima Sportswagon (2017).