Couple of other points.
I miscalculated the weight gain - it's 63kg from the old CD to the new one. (CD 1249kg, CDX 1266kg, CDXi 1283kg).
Fuel economy is claimed to be 7.8L/100km (old Astra: 7.6L/100km)
Boot size has shrunk - 350L in the new hatch, compared to 380L in the old one and 450L in the old sedan.
Also, the diff ratio has changed from 3.74:1 in the old model to 3.94:1 in the new, meaning that the extra weight would be offset and performance might stay about the same.