Mazda 3 (Sedan) (2014) is 300 kg (661 lbs) lighter than Opel Insignia Sports Tourer (2015).
Opel Insignia Sports Tourer (2015) is 334 mm (13.15 inch) longer, 60 mm (2.36 inch) wider, 58 mm (2.28 inch) higher and has 141 liters (4.98 ft3) bigger cargo space than Mazda 3 (Sedan) (2014).