GMC Sierra 1500 (2021) is 308 mm (12.13 inch) longer, 176 mm (6.93 inch) wider, 354 mm (13.94 inch) higher and has 1168 liters (41.25 ft3) bigger cargo space than Opel Insignia Sports Tourer (2014).
Opel Insignia Sports Tourer (2014) is 390 kg (860 lbs) lighter than GMC Sierra 1500 (2021).