Oh yes for sure, I would even enjoy it to be honest.
I would admire the camera and the photographer and I would wander how the film would be when he develops them. Someone using such camera would at least know what's he is doing.

I would be much more afraid if they would walk in with a Canon 400D with the kit lens and nothing else

Less skilled... I can live with that but I would wander where you should draw the line, if you don't know the aperture of the lens you're using and use the cheapest print shop you can find I think you are doing something wrong.
It looks like people that our out there for the quick money and aren't that concerned about the photos.

I bought my DA*50-135 for the same price the Sigma is now just a year ago so for me it was an easy decision.

It depends on what you want to do if the 50-135 or the 70-200 is better.
For portrait the 50-135 is just perfect but for sports I would go for the 70-200 just that extra reach makes it more useful there. I also consider the 50-135 a better walk about lens, smaller size weather-sealed and wider angle makes it handy.

Ah yes you're using PS5, forgot that.
I only know Photoshop up to version 7, the rest is before my time.

It doesn't work like that and the design is different from the lens but well yes there are tricks to get a lower f-number then f/1 but it's going to be a macro lens.

ps. actually you need to measure the front element with telephoto lenses but yes the rear also limits it don't ask me how and what at 2am

The 400mm f/2.8 has a filter diameter of 145mm, there fits your 143mm perfectly

45.5/42=1.08 more then enough room to make an f/1.2 lens.

I ain't 100% sure 45mm is right, got it from the pentaxforums.com.
The Nikon F-mount is 44mm for comparison and I know they are almost the same in size as the K-mount.

What about these?
http://news.bbc.co.uk/2/hi/uk_news/8293035.stm
They won in court btw link

Is it only resizing?
I'm working from CS4 now but the CS2 looks quite like CS4 out of memory so try to follow.

Open CS2.
Then go to File > Scripts > Image Processor that's what you want
You can also say in that window (Image Processor) that it must follow an action.

Hefty now you know it too

No crop for me either, the fly is in a focus point and I saw it in a second when looking at your photo so no worries that nobody sees it and like Kirs says it's lovely with all the colours.

Okay are you ready.
f=F/D that will not change no matter.
Rigister of the K-mount is 45.5mm and it has a diameter of 45mm, there for theoretical the optimum lens would be a 45.5mm lens with an opening of 45mm and you will get f/1.01 now you need some flesh for the lens since it isn't made out of air so the 50mm f/1.2 is on the limit of the mount.

When you go past the register of the mount (lets say 30mm) your lens will need to go into the mount or you need to use an angenieux retrofocus design.

But you're right that it's easier to make faster lenses on APS-C then on 135 film but f/1.01 it the theoretical limit of the K-mount and what the practical limit is?

Satisfied with the answer or do I need to make a study out of it?
Maybe someone with more knowledge can help since this my limit

Not at low ISO, even my K10D preforms better there then the K-X