My dad bought me a Pentax K1000 at a yard sale for $7.00. It has since died but the lens lives on. I bought a cheap adapter, $19.00 so I could fit the 50mm to my well used and abused E3. I haven't really used it much, I can't seem to stop using my EP-1 long enough. But here are a couple of test shots wide open.
Sorry I am not any better at test shooting. But maybe this will give you an idea of what you can do. The subject of adapters comes up often.