The DA 25mm is not recommended on film bodies due to vignetting (the lens hood is designed for the smaller 645 digital format). The Pentax DA 645 25mm lens became available in April, 2012 for $4,995 and was discontinued in mid-2015 for unknown reasons. This professional lens is fully weather-sealed and features silent autofocus. As a consequence this lens will now produce vignetting on Pentax 645 film bodies, so you should go for the D-FA version if you also shoot film. It is identical to its D-FA series predecessor, except that its lens hood has been stretched to give better results on digital Pentax 645 bodies.
The SMC Pentax-DA 645 25mm F4 AL SDM AW is an ultra wide-angle lens with a field of view of 95.5 degrees diagonally.
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