Originally posted by D1N0 Nope no mix up. There are a lot of OOF highlights in the sample pics, those are not really the same thing as bokeh.
I guess what impressed me is the softer, more pleasing edge outlining of those OOF highlights, while maintaining very good subject sharpness. I have had the M version of the 50mm f/1.4 for many decades. I got the F 50mm f/1.7 along with my first Pentax AF camera body around 1989, then around 2007 or so I bought the FA 50mm f/1.4 at such a low price, I could not pass it up. All bought brand new. Now I wonder about differences between the M and FA 50mm f/1.4, based on what you are showing here. As far as subject sharpness goes, the F and FA 50mm f/1.7 (same optics for both) have been shown by lab and image tests to have superior resolution wide open at f/1.7 than the corresponding 50mm f/1.4 versions have, even at f/2. But this does not address other image aspects, and you can still get a higher shutter speed for stop action or for hand held in low light from f/1.4 vs. f/1.7, which can be very important.