But full-plastic good!

Yes, it is up to the glasses made entirely of plastic, but it feels even a tick better at than the 35mm 2.4.
At maximum aperture there is something dreamy in look, which is perfect for portraits. There is then a sharp main image a slight veil that contrasts somewhat mitigates. But very subtly and tastefully. Dimmed wirds then at least properly crisp from Aperture 2.8. The colors are typical Pentax-class, for me the main reason to use Pentax lenses.

The lens is by the way, like the DA35mm 2.4 full-frame compatible, tested on analog Pentax SLRs. I even have the feeling that the optics is 1: the old SMC M 50mm 1.7 taken from the analog days 1. I habs with identical camera settings compared - almost no difference. The Bokeh is my Eighth smoother and less hectic and distracting as the FA 50mm 1.4, which was the main reason why I selbiges returned.

The AF sits on the camera internal adjustment well and safe, for the current price there is an absolute buy recommendation!