Hey guys, I picked up my Nikon D600 with a 50mm f/1.8G yesterday (I sold off my Canon 7D and the rest of my Canon gear to get it) and happened to go to a poker game at my boss's house last night. This was the perfect chance to try out the low-light focus, big aperture of the 50mm and the high ISO capabilities of the D600. Here's what I came away with:
These were all shot _without_ a flash and it was pretty dark. All, or almost all, are at ISO 6400. I was shooting in the highest quality jpeg modes and had High ISO Noise Reduction set to "Normal". They were only slightly edited in LR3 before getting posted.
I am super impressed with the quality. Yes, there is noise (of course at 6400!) but there is a TON of detail in there too. I applied just a tad more NR in LR3, but I think the balance between noise and detail is awesome. Note that I uploaded the full resolution photos so you can get to those for each image if you are interested.
I didn't have any problems focusing in the dark. I used a lot of off-center focus points and never had any trouble. Unlike the Canon 50mm f/1.8 the Nikon version _does_ have an ultrasonic motor... and it focus fast, accurately and quietly. It's also damn sharp wide open.