Congrats on the DA*55 purchase!
I had initially tried this lens out for a few hours when it was released and at that time I was disappointed with the AF speed and the image rendering compared to the Voigtlander Nokton 58.
I still wanted the lens and needed an AF option in this FL range so I bought the lens anyway. After spending a couple weeks with the lens, I have to say that as far as image rendering, I would now (that I have taken some time to get to know the lens better) say that the image rendering is on par with the Voigtlander 58.
I still rate the bokeh of the Voigtlander better, as the DA*55 does have a little of that classic Pentax "nervous" or "double-line" type of bokeh, where as the Voigtlander 58 is a bit more subtle and diffused. But there are so very very many shooting conditions that you might encounter in which these subtleties will not show.
AF speed, I think it is a different experience with SDM vs Screw Drive, so maybe the comparison shouldn't be made, but while initially it did seem that the AF was slow on the DA*55, It really isn't as physically slow as it feels like it is. I noticed that vs. the FA50, the FA50 gets there faster, but then does little back and forth movements until AF is locked. The DA*55 might take longer to get there but it seems to go right to the spot and locks. So while racking from infinity to minimum takes a little longer with the DA*55, the total actual time to fully lock and let the shutter fire, is much closer in total time.
Obviously from point to point focusing (rather than nearest to farthest) there is hardly anything to notice let alone be worried about.
AF accuracy is very impressive, I have a much higher percentage of AF correct shots taken, than with other of my AF lenses, so this is turning out to be one of my best AF lenses after all.
F1.4 if you nail the focus, is very sharp.
here's a couple of images, the first at f1.4, the second at f4.0