I have done a lot of HDR recently with my k-7 and photomatix.
I have the user setting setup for bracketting with 0, +-0.6, +-1.3 EV which I find achieves excellent results. I did experiment with 0, +-1, +-2 EV but there was a very noticible increase in noise when processed and I didn't like the overdone HDR look.
I have the Photomatix plugin for Lightroom, which I find very convenient and I am very happy with the combination and results.
Here's a sample and check my
flickr stream for more:
