Back when I had my E-PM1, I purchased a new Panny 20/1.7 lens and promptly returned it. In low light, the lens took forever to focus, if it obtained focus at all, the lens complained loudly doing it, and it very often missed focus. I was very disappointed, but I assumed the problem was the lens (because of the complaints I'd read about its AF performance), and I just got a refund. Well now I have an E-M5 and an E-PM2. I decided to once again try the Panny 20/1.7 because so many people love it and still recommend it even on Oly bodies. My lens arrived yesterday, and so far I've only used it on the E-PM2, which is configured to use the small AF box. In my tests so far, the lens is much quicker to focus and accurately obtain focus than my original 20/1.7 on the E-PM1. It makes a little noise, but I honestly don't find the AF on this lens (on my E-PM2) any more objectionable than my Oly 17/2.8, and I find its performance acceptable. I could certainly make the lens hunt, but so far I'm pleased with the performance of the lens. In addition, I've taken several test shots at ISO 6400 and see no banding. Of course, I'll have to give the lens a real workout and see if it continues to function as it has during my brief test. If it keeps performing as it has so far, I'll definitely be keeping this copy of the lens! :smile: But this makes me wonder if either my original Panny 20/1.7 was defective, or if this lens simply works better on the E-PM2 than it does on the E-PM1. Or is it the small focus box that makes the difference? Anyway, just thought I'd see what y'all think about this.