Arturia V Collection is (to me at least) the best value for softsynths Ive found. If someone knows of something better please let me know as I would love to get that too. For fun, I put up Prophet 5 V and compared it to my Prophet rev 4.
On *most* patches, I could get something really close that was, say 99% of the way there in the bottom 2 octaves. Above that, the Arturia falls apart(filter just isnt there). Does that make me not like the Arturia? hell no, still love it. I have decent approximations of some bad ass gear that still sounds great even if it isnt a precise copy. I love Synthi V, Synclavier V, CMI V, DX-7 V, Easel V, SEM V, and Matrix V.
On the other hand, Piano V, Wurly V, Stage 73 V are crap and when I try to use them I just end up frustrated.