I would say the differences in nose and deck shape towards 09 has no impact in light wind performance relative the 07/08 shape but possible can improve high wind performance a bit. A thinner deck around the mast foot generally has that effect (but the problem is that you have to put back the volume somewhere, so you can't take it too far). But again, the change is very small so expect no miracles.
But there seems to be some other small changes too (outline in the tail fx) and to me the new 80 clearly is a bit more agile and give a faster impression, sort of. This could be an affect of the lighter WoodCarbon construction I've used though. Hard to say and the difference is much smaller than the 06 to 07/08 change.