DPReview deserves a break here. All of us would have thought that a FA50 or DFA50Macro are good enough to compete.
But with today's high Megapixel sensors and 100% measurbation, tiny differences matter and DPR's own results show that e.g., the FA50 is outperformed by e.g., a Sigma 50/1.4. Moreover, the FA50 didn't DPR-test sharpest in the center.
And without any conspiracy, DPR may just have more lenses and more time at their disposal when they test Canikon. I can assure you that careful testing is very time consuming. I'm sure though that with all the vocal Pentaxians, DPR now uses as much time for a Pentax
BTW, DPR seems to have posted new crops for the K-5.