I have shot 1300 frames using my old K-5 battery. I had read that battery life was a lot shorter on the K-3, but I think that is worst case. I don't use the AA filter or LiveView and I bet they both consume a lot of power. I'm still showing 2/3 power, but I'm not sure how accurate the battery meter is.
I'm not liking the mode dial lock switch. I use a Black Rapid strap and the camera hangs to my right with the grip up. The lever brushes against my coat and unlocks and then the dial moves. I never had a problem with the metering switch moving or the old dial lock. I'm not sure this is an improvement. I set it on U1 and locked it and twice I found it unlocked and once my mode switched to U2 without me knowing.
Image quality is very good. This shot is at ISO 1000 in a convention center (Mercury Vapor bulbs) and you can see finger prints on the jar. The JPEG appears to be showing color moire in the black cloth, but its not showing up in LR on the original. The SR is good enough that I could "sample" around 20 different bourbons and still get sharp shots.