BMW Z4 (2018) is 8 mm (0.31 inch) wider and 101 kg (223 lbs) lighter than Opel Insignia Sports Tourer (2014).
Opel Insignia Sports Tourer (2014) is 589 mm (23.19 inch) longer, 209 mm (8.23 inch) higher and has 279 liters (9.85 ft3) bigger cargo space than BMW Z4 (2018).