I own the FA 35/2 and bought it in preference to the DA 35/2.8 primarily because I shoot both film and digital. There was also the matter of price. I got the FA 35/2 for $290 from Adorama back when it was still widely available and street price was low. My advice would be to consider the type of shooting you do, price, and the need to support the 35mm format. Both are great lenses.
As for my impressions...I like primes and the 35/2 is on the camera most of the time. It is sharp, has good contrast, colors, etc. As for build...it is mostly plastic, but very solid and smooth with a very usable manual focus. Is there anything it doesn't do very well? I would have to say that I have better lenses in my bag for portraits and subjects where good bokeh is a plus. The bokeh on the FA 35/2 is not bad, but it is not particularly good at some apertures.
Here is a link to photos from my Flickr photostream that were taken with the FA 35/2. Included are a number of landscapes, some done on film, and even a few that made it into PPG:
Flickr: FA 35/2 on fotostevia's photostream
White Bark Pine, Crater Lake, Oregon K10D, Pentax-FA 35/2 Flaming Branches K10D, Pentax-FA 35/2
Steve
Last edited by stevebrot; 06-03-2010 at 08:42 AM.