It's most certainly Camera RAW program, which I figured. It's not the camera.
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Here's one thing I can say. If you shoot the WB incorrectly in fluorescent or tungsten temps, you can't correct them in post 100%. If the camera shoots at those temps to begin with, you can.
When you shoot in RAW it does not matter what WB setting you shoot in. This is simply a preset that communicates to present the JPG rendition or is communicated to editing software to get you close to true neutral grey.
If you shoot in RAW the information in the data file is the same regardless of WB setting. Much like the NR settings, sharpness settings and picture styles don't matter. That's the point of RAW.... you have it all there to work with....
This is not true Even if you shoot RAW it is being generated depending on settings in your camera. For example, make 3 high ISO shots with different noise reduction settings (no / normal / high) and you'll see difference in RAW (I did this test on 7D, not sure if all cameras behave the same).
It may be way better than the 5D3...
Oh, there's no question. The 1D X is way better than the 5DIII... Flash back a few years to how the 1DsIII had 'better color rendition' and 'better low ISO performance' and 'whatever' compared to the 5DII, despite the 5DII having a better sensor (according to Canon's white paper on the 5DII/50D). The theme is the same - there are lots of features that make the 1D X better, but if your main criterion is IQ, you'll save a lot of $/£/€ by getting a 5DIII.
I've the 1DX and 5D3 and within the ISO ranges of 400-51200 the 1DX smacks the 5D3 with a big wet comedy fish.
And those are the real ranges to test. I'm fed up seeing the 'here's the picture I took with both, what do you think' posts.
I've shot 5 weddings, some 8000 frames in total with the 1DX, almost the same number as the 5D3 and there is so much more than iso range that's an improvement. The Auto White Balance for one is superb. No real white balance corrections to do in post.
The images have miles more clarity to them too, despite losing 4 mp I can retrieve detail I could only dream of with the 5D3, the hair on peoples heads and pollen on flowers being good examples.
ISO1600 - F5 - 1/160