Originally posted by sTi One thing, however, puzzles me: you write of the DA*55 that it's "Color rendering is more or less like an average Tokina (which is good)". I'm not sure what you mean by that as I never owned a Tokina lens and don't know about their special rendering characteristics. Was the DA 55 also co-developed with Tokina like some other DA lenses?
I believe it is a Tokina; it certainly performs like one.
In the camera shops I've heard sales people recommend Tokina as the brand to look at for Canon or Nikon; I agree with them. Their performance often equals (or at least comes close to) lenses from the four big DSLR makers, while Tamron and Sigma often fall noticeably short.
Every lens renders uniquely, but there are distinct trends within brands, and usually within lines or generations from that brand as well. Much of it may be from differences in the glass itself. So IMO (and probably many others here too) if Pentax isn't going to develop a lens themselves, having Tokina do so is the next best thing, since Zeiss is already taken by Sony.
Each of the FA Ltd lenses is one of the better lenses ever made, but each is fairly unique in its rendering. So what I'm saying is that the DA*55 gives nice colors, but the FA43 will give you even more vivid colors just by changing the lens.