I finally returned my K5 kit and DA70 today! And I am really happy that I did!
Overall it is a good camera for some of you I am sure, maybe with good IQ and colors, but it has its certain limitations and flaws.
Was just playing around the last few days with AF, as I started using this thing more extensively I recognized that I had severe AF problems, although I had fine tuned the AF for both lenses several times. I still got out of focus results again and again - even in good light (afternoon indoors) - situations which NEVER EVER screwed up my D700. And trying to manual focus with that OVF is just a joke, at least it does not work with my eyes anymore, while the D700 again imposed never such problems on me.
WRT resolution - well as I was warned the 18-55WR could not even come close to resolve what the sensor of the K5 can do. But especially in very low light in combination with ISO6400 the results are just for the garbage bin, even if they are in focus. But I know this is (was) my fault as everybody here told me that the kit lenses are weak. Only thing is that I had expected too much.
The DA70 was the highlight of my kit, seems to be a decent lens, although I do not like the ergos and handling of it.
Overall the K5 with lenses did not hold what I thought it could do for me. I bought it as add on to my D700 especially WRT smaller size and less weight. But the handling of it showed me that it is still pretty big compared to my M43 system and does not deliver better IQ. Yes you can get up to higher ISO but the results are then really questionable.
And yes - I know that these results could get better with better lenses (zooms), but the talking about a 50-135 or 60-250 the size gets again very big and I do not see so much advantage to Nikon FF.
Hope all who the K5 have more fun with it, for me it was a nice adventure but finally I am really happy I could just send it back and step out of this system!