A photo from a short walk with perfect light. I love the old Micro Nikkor 55 3.5. Not really perfect, but dos a good job as the D700 does. Do i really need a DF?
Well, I found a real improvement in macro/close up work using the Df after the D700 (which I liked a lot) for numerous reasons :
# high ISO allowing to take images in low light conditions (forests, woods, shadowed areas, end of day, ect...
# less difference between high and low light, hence more details given (what we call in french : dynamique, but i don't know the translation). its sensor is the same as the D4 one.
# lighter than the D700 (think about tripod always useful but you have to carry it in the field)
# and I own several ''non AI/auto'' lenses which I couldn't use with the D700.
So, if you plan to make many close up picture, that would be a sensible choice...
NB: I didn't find a pic made with the Df, so here is one with the D700 for the moment.