[Brightcolours]

The problem with AA-less (be it from Leica, Sigma, or whomever) is that it does not only make moire patterns and aliasing stair stepping, it also just records detail that is not there. Some people seem to like it, and interpret that as being sharper, giving more detail (just hang around Sigma forums to notice that). But in reality, it is not better than over-sharpening your images in software.

Both I find ugly and silly, and both have nothing to do with real resolution or detail.



Reality is: subjects are not perfect to be broken down into hard edged squares of the size determined by pixel pitch. Details in a scene do not have edges that coincide magically at borders between square pixels. At least in the computer graphics industry the last decade or two anti aliasing is universally used to increase the quality of graphics.



AA-filterless (no matter what kind of sensor, bayer CFA, sigma/foveon, gray scale or other) will always record false detail. And like some people love over-sharpened images, or failed HDR conversions, or other oddities, there will always be people that like AA-less cameras producing false detail. In that sense, it is a matter of taste. What is not a matter for discussion is that an AA-filter actually has a reason based on solid science, and is a valuable part in a camera to capture a scene as faithfully as possible.