Mazda 6 Atenza (2018) is 29 mm (1.14 inch) higher and 307 kg (677 lbs) lighter than Opel Insignia Sports Tourer (2015).
Opel Insignia Sports Tourer (2015) is 638 mm (25.12 inch) longer, 88 mm (3.46 inch) wider and has 39 liters (1.38 ft3) bigger cargo space than Mazda 6 Atenza (2018).