I find the lens a bit too heavy to carry around in hiking purpose. It is a long lens and I feel better balanced when I have it mounted on K20D. The lens does well for me in sharpness and bokeh. The PF/CA is one thing that I still find occasionally in shooting. I recently used it with K-x in weekend hiking trip. I especially like the contrast and bokeh in the close up at the long end in 210mm.
Sunol Wildflower Festival with Pentax K-x
And in the last fall, I used it with Pentax K20D for some fall pictures while visiting Mountain View Shoreline Park.
Fall Color with Pentax K20D