Shawn,
I purchased one of the EX DG 70-200 f/2.8 a few months back. I ran sime resolution bench tests and found the lens to be extremely sharp. I took it out on a leash (
) for my first outdoor shooting to see if it could really perform in the real world. All I can tell you is that it is an outstanding lens.
I had thought about putting out the 1800 bucks for a used Pentax * 80-200 f/2.8 but now feel...why?
I have a couple of images that I shot of Mo Rocca in Bryant Park, NYC yesterday morning (posted in the Post Your Photos section of this forum) and think that the lens showed a remarkable ability for sharpness...in challenging light and hand held.
If you purchased the Macro version, the sharpness may not be quite as good as the non macro version...but very good none the less.
Hope you get yours soon and hope you enjoy it.
I must say, that having carried it around NYC yesterday, I am really looking forward to Pentax's 50-135*DA. Sometimes I felt that 70mm on the Sigma was just a touch to tele for my needs. That said, it is a wonderful lens that will see a lot of use on my camera. I think this lens can stand up with any of the f2.8 zooms by any of the OEM camera companes.
Stephen