Originally posted by stevebrot 
Ummmm...not in the current line-up* and FWIW, the Sigma 105 is not available in K-mount. Current macro lenses in K-mount are (I believe) limited to:
- Pentax 35mm
- Pentax 50mm (has aperture ring)
- Sigma 70mm
- Tamron 90mm (has aperture ring)
- Pentax 100mm
With any luck, the Samyang price will fall. In which case it might be a nice option, particularly if the lens has the typical Samyang metal build. As for the value of AF, I guess it depends on choice of subject. I seldom use AF with my macro lens.
Steve
* No current model Sigma Macro has an aperture ring.
there's also the laowa/venus 60mm 2:1 macro lens
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