The success of the 1DX has resulted in more used 1DIV's becoming available on eBay and CL in the $3000~3500 range.
I have thought about upgrading my 7D for wildlife and sports (personal use only) to a 1D platform and the 1DX is outside of my budgetary grasp for a while, so question to those who have made this move.....
How significant is the difference in performance?