You are assuming that the 5D mark III has a crappy sensor. Other than the DxO test, I have not seen a single report complaining about the sensor. Most reviews have highly praised the mark III in every way. Though I do think that the MIII was more about perfecting the sum of the parts than working on a specific area. Same with the 1DX which uses even a smaller 18MP and not offering a larger MP body. The Mark III is a clear improvement in every area, including the sensor. And if you believed that DxO was the benchmark for sensor technology, you would sell your D4 for a D7000.
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