Here the results at ƒ/2 are compared to ƒ/4, showing a high-grade result at ƒ/2 along with a superlative result at ƒ/4.
Live View was used to focus precisely at ƒ/2 on the indented metal just under the “eyes”. The camera tilted down slightly.
The overall characteristics involve vignetting and depth of field. Except at high resolution, sharpness is apparently not a lot different at ƒ/2 than at ƒ/4, but see the crops: ƒ/2 is already at a high level, but ƒ/4 is superb.
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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.