Mazda 6 Atenza (2020) is 69 mm (2.72 inch) higher and 192 kg (423 lbs) lighter than Opel Insignia (2015).
Opel Insignia (2015) is 448 mm (17.64 inch) longer, 288 mm (11.34 inch) wider and has 19 liters (0.67 ft3) bigger cargo space than Mazda 6 Atenza (2020).