If you have a 5D III, you are welcome to use this calibration pre-set to calibrate your 5D III. There is a noticeable de-saturation in the reds and greens with some minor adjustments across the board. This preset is calibrated against a SpyderCheckr and is stored as a LR preset.
Images will lose a little pop, but they should come through as more accurate. Can latter add any saturation/vibrance PP. Give it a shot, and let me know how you feel about it.
It is somewhat minor except for red/green.
If you want to give it a go, here is the preset. Do whatever you like with it.
If you look under the HSL you will see the changes. This is a profile that can be applied on import if you chose, it is not a "camera calibration" so in theory it is actually more accurate as there is much more adjustments possible.