As stated above, the D700 has better high ISO performance, a faster FPS rate, and a larger buffer than the D7100. The D7100 has more Dynamic Range and Color Depth than the D700. Just because a camera body has been discontinued doesn't mean that it is obsolete. They remain as capable today as when they were first introduced. Depending on the subject and ambient conditions, I use my D700 together with my D200, D300, D2X, D3, D3s, and D800E. Using multiple bodies is much faster than changing lenses.