You probably will not find a stronger critic on this forum than I when I initially purchased my D7K. The threads are endless. However, I had a faulty camera, (to a few of the other posters reading this "oh yes I did") not just soft but some times out of focus. I took it back for a replacement and although not everything was well initially although much better just soft, I battled on with the help of the folks on here.
I've cracked it now and I am really starting to enjoy the camera very much. I bought it almost exclusively for wildlife and BIF and now it's becoming more than that. Personally, 4-5 weeks ago I would have said avoid the D7K, now I would'nt be so critical. I wasn't too pleased with the fact that I had to work quite so hard to get it right, but that perseverance has certainly paid off now.
There are those who will, with the best intentions, say some of us critics were lesser photographers and lack of knowledge played a part. To a very small degree that is "perhaps" true but out of focus is out of focus, no arguement, but if you want a camera that will give you so much more than your D80, then I am saying look no further. There was a time a few weeks ago that hell would have frozen over before I would say that.