Trade up from D3 to D800?
I sold my D3 and D3x for a D4 and a D800. I could not end up with any other solution. Both give more flexibility.
I am not young enough to know everything
Going from the D3 to the D800E was like going from an instamatic to a 35MM camera.
The resolution is well , revolutionary. The MP will give your shooting a whole new outlook on shooting a camera.
Simple test. Download some full rez samples and push in, then do the same with the D3, case closed.
What an exaggeration.