Thanks. As for the processing, I typically start with a nicely edited color version. Then use a few tricks to process into b&w. Sometimes I like the b&w conversion as is like the 2nd shot above. Sometimes I tweak a few more things (curves, gradient map, warming filter) to add some color back into it like the 1st and 3rd shot above.
Here are a few from just minutes ago I took with the K 50mm f/1.4. I can't believe how good this lens is. I love it.
Model: PENTAX K20D
ISO: 100
Exposure: 1/250 sec
Aperture: 5.6
Focal Length: 50mm
Model: PENTAX K20D
ISO: 800
Exposure: 1/200 sec
Aperture: 1.4
Focal Length: 50mm
Model: PENTAX K20D
ISO: 100
Exposure: 1/100 sec
Aperture: 1.4
Focal Length: 50mm