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A usable ISO 12800 would be wonders for me. Is the 6D about 1 stop better in high iso noise control than the 5D3 then?
According to DxO labs, the 6D is slightly better than the 5D Mark III, but not as good as the 1D X.
DxO's ratings use a methodology where they test for the highest ISO setting that will maintain a signal-to-noise ratio [SNR] of 30dB, a dynamic range of 9EV, and a color depth of 18bits. Their results for those three bodies are:
1D X: ISO 2786
6D: ISO 2340
5D Mark III: 2293
By way of comparison, my 7D rates 854 and my old 20D rates 721.