That.
I don't care that it's older tech, the D700 is more camera than most people need. I can't quite understand why anyone would buy a new D7100 when you can get a used D700 so cheaply now.
Well, thats easy. Different people might have different requirements. Professionals will always go for performance and reliability. Amateurs (photo enthusiasts) might actually benefit from having some of these new features. And I am sure even the most happy D700 user will find at least one feature that would be great to have on the D700.
pro newer higher-end consumer cameras (D600, D610, D7100):
- video
- much better live view
- great dynamic range
- megapixels (larger prints, tighter crops or downsampling resolution benefits)
- dual card slots
- latest control tweaks like U1/U2, easy ISO, lens-aware Auto ISO setting, etc.
- focuses with slower lenses at f/8 and autofocus is working at -2 EV (D7100)
- smaller and lighter
- consumer oriented features like in-camera RAW development, smartphone tethering, £3 wireless remote, time-lapses, in camera HDR, better JPEG engine, etc
- 100% viewfinder
- quieter shutter
pro D700:
- construction
- better handling and more direct controls
- AF speed
- hi iso performance (compared to D7100)
- faster rate with grip (slower without)
- smaller files
- better integrates with other pro cameras (shares card format, can use pro-batteries in grip, AUX port to share accessory, NPS service, etc).
- proven and reliable with no known quality issues
Everybody needs to make his own decision about what's better for him. But I can see why some people might want newer consumer cameras. I still think the D800 is probably the best blend of the old & new.