I read all reviews, and classify "negative" reviews into two types:
1. Those who are out to bash the camera (which I take their views with a large pinch of salt), and
2. Those who actually bought the camera or those known to be unbiased (which I tend to trust more, unless the comments are emotional).
I especially sit up and notice when a "fan" turns around and give a negative comment.
Before today I have never heard of "Klaus", but from his posts he appeared to be a K-5 owner, and not out to bash the camera in any way.
Having said that, his priorities in a camera are different from mine - to him, high ISO is not important but to me, it is. For him, LW/PH resolution is critical but for me, it's not so. So while his views are valid, it would not influence my decision to own the camera. However, it is good information to know and I appreciate him for posting them.