may i ask you why you class it as a downgrade and why you think the 7d is better.this may answer alot of my questions
Hmm, when I say downgrade, I guess I am talking in terms of price and not much else. Again, I am not trying to give full frame a bad name but personally, after I had bought into full frame, I was still left wanting. That's the feeling I got. I felt I had listened to all the hype, instead of listening to my heart and my style, then made the wrong choice, for me anyway.
There are things that I do miss about full frame, high ISO noise handling is one of them. I was scared when waiting for my 7D to arrive, thinking have I done the right thing. I had done a lot of reading before making my decision, there are a lot of horror stories about the 7D. Noisey images at ISO 400, AF issues, the lot. When it arrived I found none of those things. AF worked perfect on all my lenses with no microadjustment, images weren't soft. Sure the images are noisier than the 5D mkII, but not as bad as people have made it out to be. It's not so horrendous it will make you cry sort of thing, in real life shooting, it's more than acceptable. In fact I still shoot ambient light at ISO 3200 on the 7D sometimes, just like I did with the 5D mkII.
Another thing is depth of field. How the 5D mkII has a much more shallow depth of field so if you're into portraits, then that's the way to go. If you check my gallery, majority of my shooting is portraits. Again with the 7D, stick on a fast prime and you don't really miss out on the shallow DOF.
This is how it worked out for me Stu. With the 7D, I found that I can still shoot great landscapes and portraits (I'm sure you've read in places people using the phrase, "Landscapes, ambient light, portraits - 5D mkII. Sports, wildlife - 7D"). I still shoot ambient light at high ISO, but I have gained awesome AF tracking, wireless flash capability, an extra 1.6 reach without using an extender and losing f/stops (I'm not a big fan of wide angle, I'm more of a candid sniper

), I got 8fps, better movie mode and button layout. That's just of the top of my head.
So what I am saying is that for my style of shooting, I found that all the things I did with my full frame body, I could also do a pretty good job of doing with the 7D. But I also gained a lot more uses out of the 7D than I did with the 5D mkII. All of that benefited me, all in a cheaper body too. At the end of the day, don't listen to the hype. Look at your pictures, and ask yourself, "Will this camera work for what I want to do with it"? Then make your choice

All the best!