What you say about sensor he size is correct if you are the same generation of technology. If you compare the D700 to the D800/e you will find the photo site receptor of the D800/e is smaller. Sorry I do not have the exact specs at my fingertips. Just Consider that the D800/e has 3X the photosite receptors in the same FX area as the D700. By the way, I have a D700 and love it, just getting better glass at this time myself.