This afternoon, i was lucky enough to get to play with a Nikon D700 for 20 Mins or so. So i just thought i'd give you a run down in comparison to my 40D.
ErgonomicsAs soon as i picked the D700 up, i instantly noticed how much heavier it was than my 40D, also how out of balance it was with it's 18-35mm lens on. I persaonlly thought the Grip was really awkward and horrible, and really hated the indent, i just couldn't seem to get the right grip, which was comfortable.
I instantly love the top LCD, as in comparison it is much bigger and nicer to look at, than on my 40D. Then i looked through the viewfinder

, it's enourmous, also really nice to look through, although because it was so big, the shooting info almost got lost in the bigness of the viewfinder. The screen is just brilliant, and it's so easy to see if something is sharp or not. There were also so really cool gadgets on the camera like the 'Virtual Horizon', and the AF in LV was pretty cool.
In my opinion there were FAR TO MANY AF POINTS, i got confused by looking through the viewfinder, as it was obstructed by all the these things, and my eye was drawn to the AF points not to the subject.
I found the speed, slow in comparison to my 40D, when changing settings, although i am sure i would get quicker with practice.
So i am still a firm believer that the 40D/50D has the best ergonomics, of any DSLR around, and yet to be proved otherwise.
BTW, unfortunately i didn't have time to grab any test shots, or anything else.
Interesting findings. From my experience with Canon cameras, the ergonomics, handling and control layout was the first and main reason I had to dismiss the idea of purchasing a Canon. I just found, and still do find, Nikon cameras light years ahead of the Canon as far as handling goes.
I started off with a D70 and have eventually upgraded over the years to a D700. The layout is essentially the same and nothing has really changed, other than a few extra buttons. I found the D70 just "felt" right when I picked it up. It was solid and just felt well made in comparison with the plasticy feeling 350D (at the time). I've since picked up and used 40Ds, 450Ds and 400Ds. My opinion hasn't changed. They still feel cheap to me and not at all well constructed.
Horses for courses, of course, and each to their own.