I honestly cannot fathom why you would sell off the 1D IV (unless you were seriously strapped for cash, which if that's the case, well then I understand ;P).
For as good as the 70D may be, it is good "within it's class". The 70D doesn't hold a stick to the 1D IV. The 1D IV may be "older", but it is still a vastly superior device. It has better noise handling, better color, higher frame rate, more features, better features, and (at least IMHO) has the wonderful APS-H sensor size with larger pixels than the 70D (so better dynamic range.)
Outside of the "strapped for cash" situation, there is no way in good conscience that I could recommend you trade the 1D IV for the 70D. From a functionality, capability, and IQ standpoint, your trading DOWN, WAY DOWN, and I truly think you would regret the decision.