Upload & Sell: Off
owned both and roger is right on. May be I had a very good copy of version 1. yes, I could see a difference at 200mm 2.8, in both contrast and sharpness at 100%, however, I would say for portraits at least, the difference is very very small. the version II at 200 2.8 takes the 2x extender better, if that matters to you.
I sold my version 1 for 1510, and version II cost me only 1840 after rebates. to me, 330 to upgrade to a brand new lens, with better stablizer, and slightly better 200mm performance was worth it. I would say, the difference to me is worth up to 500 bucks, not more.