Yesterday I was able to test the D600 on a Aikido training. Used it with my Nikkor 50 1,4 and Sigma 70-200 2.8Low-light performance is awesome! No problem at all! I was sceptical about the AF area, but surprisingly it was no issue at all.AF is fast and very accurate... But, a bit like the D800, be careful choosing good lenses! Every tiny bit of blurryness is noticable on "bad" glass. High MP are awesome but I tend to look at pictures on 100% crop... And there you will notice the diffrence.Next to my D5100 its lightyears ahead and feels like a tank.I will post some images as soon as I can.