G'day lurchlarson,
Mate, always....
always do what your wife says. Life is much more pleasant that way.
I have the K20 & my wife has the K200, which replaces our old *ist DS & DL....the K20 & K200 are way faster, how that compares to the oppostion? I have handled a Nikon D60 which seemed quicker and quieter, but my lenses are all the older type until yesterday when.....
I added the Pentax 17-70 which has the SDM feature, and now I understand what speed is all bout, with fully charged batteries. Playing around with the 17-70 on the K20 with an almost flat battery the AF was slow, but pop in a fully charged battery and it flies......as you would expect.
SDM is on all the newer DA & DA* lenses, well worth the money.
Cheers.