GMC Sierra 2500HD (2020) is 1140 mm (44.88 inch) longer, 526 mm (20.71 inch) higher and has 1187 liters (41.92 ft3) bigger cargo space than Opel Insignia (2014).
Opel Insignia (2014) is 6 mm (0.24 inch) wider and 1111 kg (2,449 lbs) lighter than GMC Sierra 2500HD (2020).