Ricoh Imaging now offers two full-frame Pentax DSLRs, the K-1 and largely similar K-1 II, so the need for modern, technologically up-to-date lenses that can do these cameras justice is clear.

K-1 and K-1 II users have the choice of decades’ worth of full-frame-friendly glass, of course, but the HD PENTAX-D FA* 50mm F1.4 SDM AW is the newest member of the company’s premium Star (*) range. This particular lens is promised as the first in a new generation of Star optics, which claim to combine centre-to-corner sharpness at even wide apertures, high light transmission and general all-round optical excellence, all with a rugged design and high dependability.
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https://www.dpreview.com/reviews/pentax-fa-50mm-f1p4-sdm-aw-review