Hmmm - tough call. I haven't used the 21, but it looks like a neat lens love the size of those pancakes (even though I don't have any). The DA* is a great lens, but it's heavy and bulky (it's still my most used lens for landscapes or family events). I've done a quick and dirty comparison of my DA* 16-50 head to head with the DA 35mm, and it's equally sharp except in the corners and extreme edges, and based on the respective reviews at photozone.de (sharpness and distortion pages:
DA* 16-50mm,
DA 21mm ltd.), the DA* looks both sharpen and less distorted.
I think I saw you mention elsewhere that you're buying a K-7? If you are, you can forget about the slow focusing of the 35mm ltd. - it's a very snappy focuser on my K-7 (as is everything
). I would guess that the 21mm will focus faster than the DA* since it's a screwdrive lens and those tend to focus faster.
I suppose I would vote for the DA*, but they're so different, it's really hard to compare 'em.