Luka, excellent examples. I agree, I cannot really tell the difference.
This as you have alluded to, maybe to do with the 5DII combination of ZE lenses. In my experience, with the older 5DI and 17-40L zoom for landscapes, the grass and leaves were always problematic with even mild sharpening. This may have to do with the quality of the original file that is being processed. I have been noticing, that the level of sharpening for different RAW camera files do vary dramatically.