I'm very happy with the results from the 1ds3.... I don't think I could have done this shot without it.... I know I could not have done it with my MFDB. I only had 5 mins to take the photograph.
1ds3, 35mm f1.4L... available light at iso 1600 f1.4 1/40th sec. Very dark country club, I think those practicals in the background only had 40 watt bulbs in them... chandelier above/front of subject.
The 1ds3 really suits my style, as I like to shoot wide open and I love natural settings. Mind you... in the studio with my hazylight over tabletop mounted behind the 100 macro it also performs very well.