I got to try out my K5IIs today. Made up my mind that I will not return it (still in box) to get the D600 deal. So I open the box.
I think enough for the negativity for Pentax (well, Pentax deserve some of the blame,LOL). In short summary, the K5IIs is like K5 on steroid
Pictures taken with DA* lenses all looks sharper and focus is really fast in low light (no more hunting around). I have never use AF.C on my K5 as we all know, it is a little embarrassingly slow. But AF.C on K5IIs is very respectable, and I would say very usable (have yet to use it in real shooting situation). Usually upgrading camera won't drastically upgrade your image (lens will) but in this case K5IIs did upgrade your pic quality.
The LCD screen is a nice, 'easy' update and we can expect to see this type of LCD on subsequent bodies.
Now that Pentax have 'solve' the focus speed issue, we can expect if the FF ever come, it will be awesome.
Anyway, as a K5 user I thought K5IIs will not impress me as much as my upgrade from K200 to K5, but it did.
But there are aspect of FF sensor that are still attractive to me and will I get one immediately if Pentax offer one. If not, will say hello to Nikon.
Right now, will play with the K5IIs while I wait.
All in all, K5IIs is a worthy upgrade, even if you are a K5 user. I think it will blow your mind if you use other Pentax cameras beside K5.
2013, let us hope Ricoh/Pentax bring us more exciting product! (Hello? where is the new DA* lens?!)