Not really, but I have looked at a lot of 14-42 vs 14-45 vs 14-140 threads which have given me a lot of info but none have helped me with my decision as of yet to add to my 14 2.5 kitted with the gf3 i picked up last week. Anyway, I'll be making it soon enough but when I do I'll probably be getting a used one which is really what I want to ask about. I have experience going back to my film shooting days in picking out used lenses, but it's a lot easier checking glass and aperture blades on a EF20 2.8 or 28-50 AI-s than it is on these tiny m4/3 lenses. I had a chance to check two lenses the other day, and I had a really hard time seeing inside the lens and anything beyond the front and rear elements. I guess that's mostly due to the smalls size of these lenses as well as my fading eyesight and the fact that these shops are indoors will relatively low lighting. Checking lens elements, aperture blades and contacts is one thing but what about things like electronics, IS and AF on these things, are they reliable, or are any of them prone to issues I should know about beforehand? With checking IS on EF lenses for instance, I can usually hear a whirring noise when it's engaged, and when zoomed out I can see a noticeably less shaky image on the viewfinder. I don't know if it's the same way to test on the panasonic system. Any other things I should know about when testing a used m4/3 lens and things to look out for would be appreciated.