ive never been in a 4wd cossie so I don't know how it handles in comparison to 2wd but when I had my rwd cossie e30 I was always planning to 4wd convert it because the traction off the line was terrible. I just remember my mates 4wd evo8 , the traction in that from a standing start was unbelievable in comparison.
the 50/50 weight balance in the e30 made you look like a driving god though as when the back kicked out you could hold it so easily and it would bring itself back into line without any drama
ive just went back to rwd with my c class estate. ive certainly missed it as it is so much more fun !