Excerpt: wow, I was not prepared to be so impressed with this lens. Everything about it seems to be well considered and executed. Sharpness is wonderful as is bokeh and contrast. The 9-blades make lovely 18-pt stars too. I find no detectable CA issues and though I am not an AF user for the most part, when I need it, the AF is smooth and silent via SDM. Lens is well constructed and lightweight. highly recommended.
Excerpt: This is the standard for the Pentax 645 D. It is sharp, has good contrast, and responds quickly to the auto focus. I have not noticed the soft corners that some reviewers have mentioned. The lens hood has a panel that can be removed to access filters. This is a nice feature.
Excerpt: Solid. Beautiful beatiful bokeh, that's been the most pleasing thing. Fast and good results wide open. Some very minor chromatic aberration in very high contrast, magnified shots. Expensive, but highly recommend. A touch more flaring than I expected for a modern lens, but minor and manageable, I'm nitpicking. My 9 rather than 10 on sharpness is probably more 645d system than lens. I've done no technical testing.
Pros: bokeh, fast
Cons: price, agree..big lens hood for this focal length
Excerpt: I think the built quality of this lens is really great. It feels very light but durable. The performance is also very good even wide open. Here it outperforms the 75mm A easily with better sharpness and bokeh. Stopped down to f/8 both perform very similiar.
Excerpt: This is a nice lens and matches the 645D body very well. The AF is quiet and manual focus is easy. There must be use of polycarbonate materials in the design because Pentax has kept the weight down, which is good. Solid construction.