Upload & Sell: Off
I would recommend the Sony 70-300 G, which is stellar and has a very large focusing ring. Since it's a Sony lens, you'd have control over its aperture via the ea-la1 or 2. In particulat the la1 would be a lot cheaper than the canon chipped adapter.
my primary interest in the canon is the compact size when retracted and IBIS. it seems like the sony is a fair bit bigger, though i have heard it is a very good performer. the sony adapter doesn't seem that much cheaper than the canon ones (excluding the speedbooster one).
I used to own this lens, and didn't like it that much. It had low contrast, the sharpness wasn't fantastic, and the onion rings had some kind of effect on the boke. It was in 2006, on a 5D, so it isn't clear in my mind, but I would recommend looking at the normal zoom instead.
thanks carsten, that's disappointing to hear. perhaps i should rent it to see if it can work for me. at this point i'm more concerned with size than iq. i'm generally pretty happy with my 350mm but i never use it due to space and time constraints. having something that is the size of a 85/1.4 would make the space constraint at least much less of an issue. that said, my use of the lens would be wide open at 300mm 90% of the time. if it isn't decently sharp at those settings it's not much use to me. if it had some troubles on a 5d i have a lot of doubts as to how it would perform on a NEX-7. my idea is that i would use this for the time being while i save for a 280/4 apo (hopefully i should have more free time in another couple of years too). perhaps i should look more at other compact options...
oh, and some pictures for the picture thread (crossposted from the leica thread):