[seachunk2]

I own a K7 & Kx. The K7 button has noticeably stiffer movement. I'm not having any problems aside from I have to push considerably harder to toggle the switch. I'd say it almost seems like its binding. I inquired with Pentax service representative and was told that the switch should have stiff movement to prevent unintentional movement such as when it's in the camera bag. I'm not saying that's unreasonable but then again, the Kx is nowhere near as stiff to toggle. I purchased the K7 about 5 months before the Kx. I believe after a few months of owning the K7 it stiffened up. Once I acquired the Kx it became even more noticeable but it's not getting any worst (or better).
I'm curious, does anyone else have both bodies and how does the smoothness of the on-off switches compare?

[Adam]

I haven't noted any difference - maybe it's just your particular camera?

[hcc]

The On-Off switch of my K-7 is relatively stiff. Certainly, it is stiffer than a number of other cameras (Canikon and co) that I tried.

This does not bother me. In fact, I prefer that the camera does not switch on while I carry it in a bag: I like the stiff On/Off switch.

I may add that I set up the Sleep mode On for the camera to swich off when I do not use it for some times. It saves battery but it also ensures that the camera is Off if I forget to switch it off.

I have my K-7 for one year and I noted little difference in the On-Off switch stiffness.

[falconeye]

I own a K7 & Kx. The K7 button has noticeably stiffer movement.[...]
I'm curious, does anyone else have both bodies and how does the smoothness of the on-off switches compare?

Same here.
Not an issue for me but I wished both, the mode dial and the on-off switch would operate more smoothly. Ah, and the AF switch too