But the 'bokeh' is irreplaceable. There is a 'Takunar Club' for this lenses in another forum. You have to see for yourself and compare.
That's kinda like telling someone with a Leica M7 that they should get a Leica thread mount lens for its bokeh or its "glow" instead of an M-mount.
For someone considering their basic lens assortment I would not recommend a lens on its bokeh alone. Much of the newer Pentax glass is very nice in this regard, anyway. I do love the way the old Takumars render an image, but if recommending Takumar lenses to someone who's only at the point of wondering what focal length to buy, I would also recommend they get a Spotmatic or other M42 thread camera to go with it. My screw mount lenses augment, not replace, my K-mounts.
BTW, SMC Pentax lenses (no letter following, like M, A, or FA) are the first K-mount lenses by Pentax, and are the same as the Super Multi-coated Takumars. So there's that, too.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.