Originally posted by KungPOW K100D: Selectable focus points, Mirror lockup, Optical DOF preview, spotmeter, better low light
Are you sure the K-m doesn't have mirror lockup or spot meter? That's the first I've heard of that.
As for low light performance, K-m focuses better by all accounts. I've never used one and can't compare noise levels directly, but I *have* compared with my K200D (same sensor as K-m) against the K100D, and I say it's a draw. Sure, if you blow both images up to 100%, the K100D shows less noise - but tha'ts only because you aren't blowing it up as much (100% is bigger for a 10MP camera than a 6MP camera). Comparing at the same size, the images are close to identical in noise - and the 10MP camera captures more detail, giving you more leeway in deciding how aggressive you want to be with noise reduction.
Quote: K-m: More pixels. Newer. faster autofocus.
Some other usability improvements too in the button layout and menu structure.
For me, the decision between these two would basically come down to optical DOF preview, resolution, and price - and the K100d would probably win for me if those were the only two options being considered.