Dude, in your example the K5 is out of focus (it is so obvious I wonder how you can't see it).
In the examples below you can see the difference in detail both in RAW and jpg from K5 vs D7000 - 60D and D300s. I took the liberty of magnifying them to 400% (with zoom, not resizing) for you to be able to see better. For the resolution comparison K5 is in the upper left. My settings for raw were 0 NR and nothing else. The jpg files were untouched.
The last image illustrates the noise at minimum ISO for each of the cameras (k5 is right down this time, sorry).
I also made a comparison with the K7 (not included here) and the K5 has a clear better resolution. My only thought is that your lenses have back or front focus and it is obvious if you shoot a plane to get soft image, that's not from a strong AA filter but from a slightly blurred image. This problem is persistent in most of the images also from Imaging-Resource, just look at the model pictures for each camera (k5 has a clear front focus).
With best regards, Alexandru