http://www.dcresource.com/reviews/pentax/kr-review/
Have a look! This review is good enough, I think.
But nevertheless, before you're (to be) decided, just beware of all those technical (design and quality) issues that K-r might have. To see some of those (widely) reported cases, my Blog is always a good place to search, I really want to say! ;-)
http://www.google.com/search?q=K-r+Issues&btnG=Find&domains=ricehigh.blogspot.com&sitesearch=ricehigh.blogspot.com