I have read one or two comparisons on it but i figured there was a ton of wisdom to be picked up from here. (I searched a little but didn't find much discussion here on it)
I have a friend willing to sell me a Canon 70-200 f2.8 IS V1 for short money. (>$1500) I am checking it out tomorrow but it was described as in great condition (he gave it an 8 out of 10)
But I had my heart set on waiting a little bit for a V2 copy when the funds would allow.
Considering the V2 is going for $2,000+ still and this one would be saving me several hundred dollars. Do you guys feel the 2nd revision is worth the extra coin? Would it even be that noticeable in everyday shooting?
Body is a 5dII

There are improvements in the Mk II but if it's worth it or not depends on your buying motives. If you are going for the "best" then get the Mk II but if you still want a good lens for the money then the Mk I is fine. You could also look at the new 70-300L which is going for around the price of the used Mk I you are looking at. Of course it's not f/2.8 but if that's not a major sticking point then it's a pretty good lens.
