Originally posted by Zygonyx Well, to me the question is simple : having both FA*24/2 and A20/2.8, both of them using 67mm filter shreads, i don't see much interest for this new and overly "limited" lens (in aperture) having a bigger filter shread "for nothing" at least on a landscaping point of view.
This might not be a lens for you.
That said, the FA *24 has its weaknesses and it is possible that while this is a half stop slower, it could be a better performing lens with regard to chromatic aberrations, flare, and sharpness at similar apertures. If you are satisfied with the FA *24, then that settles it, but this lens is a little wider and (hopefully) brings some things to the table that the FA * doesn't.