- another stop of ISO, both better quality in the mid-range ISOs and absolute capability (meaning 12800 in-spec compared to 6400). At base ISOs or nearby the difference is hard to detect if not impossible.
- video. The D3s has it, the D3 doesn't.
That's about it. They both do 9 fps, 11 with no AF between frames. The D2x is a great camera but the D3 really is a lot nicer to use and is a LOT faster and more responsive.
Personally I hesitate to use a D3/D2/D4 with a D700/800/et al because the control layouts are so different. It's nothing that I couldn't work around eventually, but for me a higher res solution is probably a D3x, which has identical controls to the D3/D3s and similar to the D2x. (Along with compatible batteries, chargers, L-brackets etc.) Note that *I* use two bodies at the same time at many events, such as motorsport, equestrian or social events. When I'm shooting other types of things, such as in a botanical garden, I'm really only using one body; the other one is a backup and probably doesn't make it out of the car. In those cases, a D700/D3 kit is no problem at all - even if it takes me a couple of minutes to reorient at first, that's no big deal. Even that is rare, since I nearly always would go to the D3 first.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!