Just a few brief words on the lens. On the images, fantastic as can be expected. Tack sharp, no evidence of distortion. No significant CA noted. The Bokeh is beautiful, although front bokeh in my opinion is a little less pleasing than the back bokeh. Handling on the K1 is excellent. On the heavy side to be sure but its perfectly balanced with no significant fatigue noticed during my time using the lens. I think if people are looking for a no compromise top of the line lens then this is as close at it gets for any system, not just Pentax.