Hey guys! First post, so I apologize if I sound like a fool who didn't use Search (I did, I promise.)
Last year I finally upgraded from my plasticky rebel to a 7D, and fell in love with the build quality and tighter controls.
I already had a trio of 28 f/1.8, 50 f/1.4, and 85 f/1.8, but my friend recently gave me his 17-40mm f/4L and 100 f/2.8L to borrow indefinitely. I tend to shoot mostly indoors stuff, so I'd love to use the 17-40L more often, but on a crop body it's really slow versus an EF-S 17-55 f/2.8 (or my friend's Sigma 17-50 f/2.
Is the 5D2 going to present a noticeable upgrade in noise performance over the 7D? One problem with my indoors stuff is that I have to bump my ISO up to 3200 at times, which looks pretty bad on Canon's ancient T2i/T3i/T4i/60D/7D crop sensor. The 5D3 and 1D-X are both sick, but those are WAY out of my price range. The 6D doesn't appeal to me terribly after I've fallen in love with the 7D's build quality and control scheme; so that leaves the 5D2.
Has anyone upgraded directly from the 7D to the 5D2? How does it do in terms of low-light performance? Is it worth the jump? I'd probably sell my 7D for around $900 used, and pick up a new 5D2 for around $1500 online (or used for $1300 hopefully).