And here is a quick, quick test of both lenses (Pentax vs Bigma) at a focal length of 450 mm and shooting handheld in the evening in the rain. Both lenses are wide open.
(I don’t know why, but the camera stabilization system works much better with the native lens than with the Bigma (the OS is disabled in it). The output of good frames is about half or three times less.)
---------- Post added 3rd Jun 2022 at 23:17 ----------
Quote: ... the new 16-50 plm is going to be my next lens.
It is an excellence lens!