I went to a club dinner last Saturday and took the D300 with Sigma 30mm f/1.4 for a few available light candids. Also took a 3f with HP5+ and 15mm Heliar. The D300 shots at 3200ASA look quite decent, but haven't souped the Leica stuff yet. My incident meter was reading 1 second at f/4.5 so braced elbows on table and gave it a try, we'll see what HP5 can do...
Here's one of the Nikon shots.. 1/13", F/1.4, 3200ASA ... Sure wish Nikon would make an S2 or SP with this sensor, or better yet the D3 sensor..... ;-)
Glenn