Originally posted by heinamj Everyone praising the Pentax 50mm f1.7 is making me kick myself for not buying the one I saw on sale about an hour drive from home!
You can find them basically everywhere. And for cheap.
I have the SMC_K 50mm f/1.2 and have had a lot of 50s including two copies of the M 50 1.4, the M 50 f2 and several copies of the 50 1.7 design. I can tell you that the 50 1.7 design from Pentax is the closest to the 50 1.2 rendering - at half the size and less than half the weight... the only really noticeable difference (other than stopping to f1.2) is the bokeh. Colors and rendering are very comparable.
Just get an M 50 1.7 and have some fun. The lack of field curvature makes it a great option for reverse rings and extension tubes, as well, where it performs much better than you would think.