The 135mm f/2 APO-Sonnar focuses to 1:4 (1/4 life size covering an area of 145 X 96mm).
Since the 135/2 APO-Sonnar is not a macro lens, one might question its sharpness at its closest focusing distance: can it substitute down to 1:4 for a macro lens like the 100mm f/2 Makro-Planar?
Flat field “repro” work is not the concern here; sharpness and bokeh are.
This image is very close to 1:4 which is the minimum focusing distance of the Zeiss 135/2 APO-Sonnar. True macro work might be deemed 1:2 or 1:1 or 2:1 or more, whatever floats your boat— it’s close range.
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Since 2007, Diglloyd Guide to Zeiss is the authoritative reference and review for all of the Zeiss ZF.2 (for Nikon) and Zeiss ZE (for Canon) DSLR lenses, including the Otus line.
It includes hundreds of pages of exclusive coverage and high resolution Retina-grade examples, in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, and recommendations and practical usage tips.