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RE: JaKo's propeller pictures, one thing of note (at least in my own subjective perception) is how much color balance alone influences the sense of "dimensionality" in the images. As shown, I agree that the Leica image has a more "flat, painterly" appearance versus the stronger sense of "3D" in the Zeiss image. However, if I tweak color balance to shift the blue cast of the Leica image towards the warmer color palette of the Zeiss, at least in my opinion the Leica image comes considerably closer (though not identical) to the Zeiss in "3D-ness." Also, my subjective opinion of what the "right" color balance should be also coincides with my strongest sense of depth from the image: go too far in either direction from neutral, and there seems to be a "flattening" effect from an apparent "color haze" over the image.
After equalizing color balance, I think the second strongest contributor to the spatial rendering of the lenses is the field curvature (moving strongly backwards for the Leica, much flatter for the Zeiss). While the field curvature is most obvious in the lower corners (given a "blur vignette" from the Leica), I think it influences the propeller most towards the middle left blade, where the Leica has shifted focus to the texture on the grey wall behind (while softening the propeller blade edge, visually confusing the image depth cues), while the Zeiss maintains a sharp-edged propeller blade against a defocused background.