10 out of 10 points and recommendedVery sharp, silent focus, smooth bokeh.A little larger than my other 50mm prime lens. The focus appears slower than screw drive. In dim lighted areas focus might be missed.
I have had this lens for a couple of months now and really like it. I use it with the Pentax KP body. It has replaced my DA 50mm 1.8, and two Takumar M-42 lens, the Asahi SMC Takumar 50mm 1:1.4 and Asahi SMC Takumar 1.8 55mm lens.reviewed September 4th, 2018 (purchased for $547)
This lens is larger & heavier than any of the other similar lens, construction is very good. I did a fine focus adjustment tuning with the KP and the lens required a +1 adjustment. The bokeh is very smooth, smoother than any other lens I have. The one problem I found is focusing in dim lighted buildings on distant objects. An example is inside our church building about 70 feet from the stage and focusing on a person. I have to take a little more time with it compared with the DA 50mm 1.8 or SMC-DA 70mm F2.4.