Bokeh is stunningly beautiful with all 3 lenses—it’s so good you’re unlikely to better it with any lens. See the examples. Lovers of bokeh will want all three lenses because of bokeh alone—even without the tilt/shift!
Stopped down to the f/8 to f/11 range, bokeh is still just as beautiful.
One striking feature of all the Hartblei lenses, no doubt due to the wide coverage of their Zeiss optics, is that there are no funky off-center optical oddities eg so-called “cat’s eyes” or rotational-motion type effects off-center— just velvety-smooth out of focus areas. The symmetric optical designs correct most aberrations for a natural image rendition.
Even though equivalent Nikon or Canon 85mm or 50mm lenses have very nice bokeh in most cases, the Hartblei offerings are distinct, and in my view, preferable. The 12-bladed aperture cannot be alone responsible, but no doubt contributes significantly.
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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.
DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.