1. A detailed mesurbation review of the K-50 with bunch of full samples:
http://www.optyczne.pl/231.1-Test_aparatu-Pentax_K-50_Wst%C4%99p.html
(in Polish)
2. Another K-500 review after the K-50 review by PF:
http://www.pentaxforums.com/reviews/pentax-k-500-review/features-and-highlights.html
But as the K-500 is just almost the same camera as the K-50, why did the review again? I really don't understand. I think most parts are meaningless as long as the K-50 has already been tested, IMHO.