I was looking back through quite a few of my 5D Mark II photos from when I had the camera, and even the in-camera JPG copies are excellent. The IQ is really great. There is just "something" about those photos that's different, not better per se, but different, than the 5D Mark III photos that I really miss. I'm getting a new one as a third body I believe. Really nice camera for what it can do. Has anyone ever compared to the 1Ds Mark III? I often wondered about that.
I actually just got my 5DmkII, new in December, at ~$2kUSD. It's a great camera. I hadn't even considered getting a refurb, but it sounds like they can be tough to come by. I felt like I got a great deal on a new one, just in time for the 5DmkIII to come out at $3500USD. :-)