Originally posted by wasim_altaf I don't think people prefer FA43 over DA40 for a mere half-stop advantage, rather for more appealing (yet subjective) rendition and depth of color, bokeh, etc., and for better manual focus ring. I doubt that it's as good as the DA40 in locking focus in extreme low light, however.
FA35 seems like another story, in league of its own, in terms of picture quality. Hard to come by, unfortunately. Perhaps look for the Samsung variant -- should be the same as Pentax OEM -- in places like your local Best Buy.
FA43 is a full stop faster than DA40. I stand corrected.