Proves how effective the dust removal really is (presuming you have it turned on at startup)...

Fuji's going to be there, hopefully with the new X-pro or X-1 or whatever.

Aside from the grain characteristics of the images, I think the DOF and lovely bokeh is a major giveaway that this is 35mm, not cropped, format - and on Pentax this means film!

My first real camera was also a Zenit E, with the 58mm Helios! What a brick. I soon graduated to a Pentax P30 (via a plasticky AF Practica model which had a light leak and went back to the shop). The P30 is a perfect little camera IMO.

Several DSLRs later, I now have the Helios 58mm again, this time in K-mount, and use it on my K7

That's not good! What on earth happened there?

Yes you can use the Helios with a cheap M42 adapter, and it is an interesting lens to have a go with. Lots of character with unique bokeh. Usable wide open and great stopped down a couple of stops.

I would have thought the seals in the lens would be just as likely to suck in water as buttons on the body, if not more so, as the moving parts of the lens cannot be fully sealed. Because they are designed to move and slide against each other!

Hmm... Well for me it was pretty much an economic decision... I had a couple of Pentax lenses, and the istDL2 was just about the cheapest DSLR at the time. I also knew I could use old cheap lenses on it. The other cameras I had my eye on were better in virtually every way to be honest but the Pentax won on cost. Possibly a false economy in the end though; look at the lens ranges from other brands. You sometimes have to pay more for Pentax legacy glass than their new autofocus equivalents from Canikon.

However Pentax bodies really have steadily improved over the years, and from the k200d to the K7, have offered something pretty distinctive for their price point, so in the end I am glad I stuck with them. Some reasonably priced, moderately fast primes would not go amiss though.

Don't know where this guy is but https://www.pentaxuser.com/forum/topic/pentax-me-super---2-lenses-32622

This is all very true! It comes down to personal preference and how much you value those external knobs and buttons, and the more robust build of the K7/5. Something nice about a metal camera too. However the ISO performance isn't as good, although it's plenty good enough for me! I sometimes think there is perhaps slightly too much emphasis put on noise and dynamic range at high ISO, although I do appreciate their importance.