This page shows how the Pentax-A 75mm f/2.8 performs.
The Pentax-A 75/2.8 is a manual focus lens, and I bought my copy in Ex+ condition from KEH.com for $159— quite a bargain, especially as it seems to outperform the $1200 (new) 55mm f/2.8 over the frame. There are autofocus versions of the 75mm out there as well, but I have not tested the AF version.
The Pentax 645D viewfinder is not symmetric, and thus it’s hard to know left/right framing precisely using the viewfinder. I did my best to frame it evenly, but it’s not quite centered. It is within 0.5° of level.
Contrast was added to counteract the relatively low image contrast (difficult lighting with some veiling flare especially at top).
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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.