http://www.prestonparker.ca/k5_iso_test.html
I would recommend the first set more as a better lens is used plus all ISO speeds are available. In addition, the second set suffers from serious focusing inconsistency that affect image sharpness, so further measurbation is actually just not so meaningful.
Besides, the AWB of the K-5 keeps a very warm tone for the samples, despite that there is something white behind the object.