Marc
i find with my 50 year old eyes that I need to don reading glasses to see these things clearly ;-)
Enthusiasts of the AA-less approach like to go on about sharpness and micro-contrast, the trouble is that in any sampled system you need to reduce MTF at Nyquist to suppress under-sampling artifacts, not increase it. Detail beyond Nyquist isn't detail, it's distortion. And the problem with distortion is that while sometimes it can fool the eye into seeing detail, other times what you see is horrible artifacts.
The problem with aliasing in landscapes for me isn't so much the obvious aliasing (reviewers always look for colour moire, don't they) but the effect it has on the "feel" of the rendering of grass and foliage from the little mentioned luminance aliasing. The example below even softened by your treatment still has obvious artifacts but these are just the gross symptoms. What I see is a kind of localised patchiness in rendering, depending on the subject. Sometimes you get nice sharpness and detail, sometimes you get strange broken, confused tones that look a bit like noise, other times you get a fabricated texture eg hair detail that renders like a canvas weave in patches. It is all so variable and random. What I find with my NEX is that some subjects look clean and sharp while other (the details of a broadleaf forest in winter for example) look noisy and messy. It's difficult to describe in words but it's basically the effect of rendering small detail as a fractured tile pattern with sharp geometric edges, then overlaying it on other small detail rendered as a fractured tile pattern with sharp geometrical edges. When you shrink this down to typical print sizes, the result looks nasty, noisy, unnatural to me. Apparently many people perceive it merely as "crisp".
Anyway, back to the easy stuff, a crop from your file:
By the way, here's an example from DPreview tests of the NEX. Compare the smoothness of the Olympus rendering to that of the NEX 5 on the curves of the coin (You need to select the "original" link and click to expand to full size). Hideous isn't it?
lum: DMillier: Galleries: Digital Photography Review