Finally finally finally got a real M42 adapter (Pentax's own, natch). It did not come in until early evening tonight so this isn't a "best" picture but simply a test pic I am excited about. I suspect I will be using this lens with the K-01 more than any other until I can expand my collection further. The sharpness and beautiful bokeh of those Zeiss lenses just kill me and I am perfectly happy with manually focusing.
This was shot at 3200 ISO in a fairly dark corner. I tossed a small noise reduction filter on it in PSE before uploading, but other than that, no other processing besides the usual RAW tweaking. Carl Zeiss Jena 2.8/50 Tessar lens.