Well done to the person who started this thread.
I just bought the 70-200 F2.8 non IS last week,so was most interested in this test.
I was worried after purchase ,about what i hear about the F 4 being sharper.well it
is like the fellow who made the comment about various brands of shavers-does it really
matter which one you get,there all going to be sharp.
I made the decesion on the fact that i will be using the lens in low light situations regularly.
If that is'nt an issue,buy the F 4,all up no matter which version of the 70-200 you own or buy
you are going to get a very good,capable lens,i do'nt think i have ever seen a negative comment on
any of these lens,appart from IS issues.