This page assesses focus shift and color bokeh at a distance of approximately 2 meters.
Sharpest focus at f/1.4 appears to be about at the 10.5 mark; keep that in mind when examining the zone of sharpness at various apertures.
Stopping down offers just enough increased depth of field to maintain sharpness at the point of focus, barely. Observe that the “11” mark is still not sharp at f/5.6, because the zone of sharpest focus has moved rearward.
This amount of focus shift is significant, and problematic on the 36-megapixel Nikon D800 / D800E; see the close-range dolls comparison.
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