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 1188 liters (41.95 ft3) bigger cargo space than Opel Insignia Country Tourer (2015).
Opel Insignia Country Tourer (2015) is 390 kg (860 lbs) lighter than GMC Sierra 1500 (2021).