It goes without saying that there is direct correlation between sharpness/detail and anti-aliasing filter. The Leica M8/9 apparently do not have AA filters, and therefore, are capable of rendering lots of detail. The recent Oly Pens are said to have weaker AA filters. My experience with the older Pens like the EP2 and the Sony NEX3 is that their images do appear to be softer than the M8/9 and my Panasonic GH2. My basic understanding of AA filters is that they prevent moire. But in looking at the images taken with my M9, I often never noticed any moire. Or at least nothing significant that jumped out at me and made me wish the M9 had a AA filter. All of this being said, why are camera manufacturers still using AA filters?? If I'm a camera manufacturer, I want my camera to be able to capture maximum detail. So why not just get rid of it altogether?