Thorthum, Excellent post.
My 1st SLR was an Olympus 1/2 frame, which eventually gave way to a 2nd hand Spotmatic SP, after I borrowed one one day. Since then I have stuck to Pentax (apart from a little used Ricoh KR 5 Super II I picked up for nicks. Nothing wrong with it- basically a tough plastic K1000) and still have all my Pentax film bodies. M42's and K-Mounts. And they all still work just fine.
And I have continued to add to my collection of Super Takumar primes.
Then there is the lens question. Those old M42 Takumar primes can still be obtained for reasonable prices on "FLeabay", except for the 85 mm units, and yes, they produce superb images on DSLR's after you work out the settings for each.
Now, to add further weight to your argument, check out this website and read what is on the
home page.
Digital World for M42 screw mount lenses
And if you want to try one, get one soon as many in the DSLR world, including Canon and Nikkon owners, are buying up these lenses and they are not as cheap as they once were.
Like you guys, I have just bought myself a Pentax DSLR, a K200D. It looks solid and feels it too. Like my Spotties. Makes me feel "at home." Not like the Canon 40D I looked at.
I am sure that it will have the same longevity as my other 4 Pentax film bodies.
I haven't tried it with any of the Super Taks yet. Still figuring out this digital thing with the kit lens.
Why aren't Pentax a big Digital seller? Marketing!!!
The local distributor and the parent company just do not market enough. Certainly not in this country anyway. Even with their Point and Shoot Digitals. We never really come across any promo's for Pentax.
Maybe Hoya make more bucks from their optical division. (Spectacle lenses, lense filters etc) to worry too much about Pentax?