Originally posted by tim60 Eddie, I recently used the ST 28/3.5 (58mm filter version) a lot in Seoul at night in MyeongDong and NamDaeMun markets. I liked the results. Also noticed the Koreans changed to low energy lamps and used so many of them that they would use the same power as the Taiwanese used with regular lamps in a night market (mid 80s) so the light felt like near daylight with different shadows and dark places. I was using it mostly at 3.5 or sometimes 5.6. And it was lovely to use.
I've tried the m28 3.5 at night and it is very situation dependent, but mostly for Toronto streets it just isn't fast enough (if I had the k5 it would be though)
I have a K7 though so the lens may be the cheaper option for speed in this case (that and i don't have the dosh for a k5 anyway currently), As it sits the next upgrade on a body will hopefully be a FF Pentax (I have no desire for canon where i could adapt some lenses, just don't like the ergonomics)