I shoot a lot of night life photography for the local paper so I am used to working in dark places. This was my first night outing with the D600 and am totally loving the pictures. These are the JPGs with a 50mm 1.8 and SB600 with omni bounce.
Yeah, I am coming from the D90 and I usually don't use primes for events due to space issues but I don't have a proper mid range zoom right now. But man I love the sharpness I get from this combo.