Japanese Impress DC Watch has reviewed the K-x, here it is:-
http://dc.watch.impress.co.jp/docs/review/newproduct/20091120_330627.html
(Google Translation in English Here)
Various full-size sample photos, taken with different settings and lenses, are posted.
On the other hand, Photozone has reviewed the DA* 55/1.4 SDM:-
http://www.photozone.de/pentax/471-pentax_55_14
Well, putting aside that Klaus is still using a totally outdated K10D to do his review, there are some interesting findings and unbiased comments about the lens. Go figure out yourself.