I have two samples of the Pentax 40/2.8. One gives what one might call normal and respectable sharpness, typical of what one might expect for a much-respected lens manufacturer, nothing outstanding though. In black and white prints it has similar qualities with respect to sharpness, tonal transition, contrast, as my 40/2 Olympus Zuiko lens. But the other Pentax sample is superb, in a world of its own, equal, or very nearly equal in apparent sharpness to my other sharpest lens, the Summaron 35/3.5. My 40/2 Summicron falls mid way between the two 40mm Pentax lenses. They're all good though.
