We were yesterday at Kaapo's Christmas party and I took Sigma DP2 Merrill with me. I knew that it most certainly will be a catastrophic journey photographically because the stage will not be properly lit and there will be a need for higher ISOs that DP2M can stand.
But immediately when I started to shoot I realized that first of all the camera focused very fast in those tricky conditions. Secondly, I saw already from the camera's LCD that exposure is very nice in all shots. Wow. What was happening? I really did not expect that good results.
Here is a shot from Kaapo's song performance. I used evaluative exposure, ISO 400, and the shutter speed was 1/30 and aperture 2.8.


Interesting that you chose the DP2M for this occasion. I’ve always found AF a real hit/miss on low light conditions. It seems that changing the size of focusing point helps, but it’s not as constant and comforting as the (notoriously bad) X100. Maybe I need more practice
The camera did well and kaapo looked like he was doing well. Did you trade in the Fuji yet? Have you tride the d600?
Jeremiah, yes I have D600 now and I love it. See my Flickr stream for some first shots. I will post some my initial thoughts here in few days. Happy Holidays!