I received my nikon D3 the other day and have been playing with the settings. Firstly, ISO 6400 is fantastic (although seems to have more noise than some reviews indicated). Its about what I was getting with ISO 1600 (HI1) on my D2X from what I can tell so far.
Also, the 70–200mm 2.8 (my favourite lens) is now a better lens for more portraits etc. Ill have to go to the 80–400 (3.5–5.6) for more reach now but at higher ISO settings, the speed will not upset me too much. I would love a 500mm 2.8 but at $10,000 its a little too much to justify.
Anyway, Ill have some photos to post shortly. I will be shooting the basketball tomorrow in Sydney (I don’t yet know if the Hawks will get any photos yet) just to test the camera out. Hopefully the Higher ISO values, FX sensor, faster frame rate, 2 CF slots and dynamic 3D focussing should help me get some keepers.