I like to use my 5D with Neutral, sharpness 0, contrast all the way down, saturation -2, and color tone 0. I'm having a hard time getting my XF100 close color wise. I can get the gamma and such pretty close, master ped a little negative, some knee, etc. but it's the RGB white balance where I'm trying to get them to match better. Mostly my 5D tends to have more yellow/red in it then the XF100.

Anybody have a good preset they can share to help get these cams a little closer?

With the 5DIII and the XF100 I'm using the following to match color:

5DIII - Neutral (no changes)

XF100
Normal
In Color Matrix, R-G is -8
Sharpness -5
Coring +8
Noise Reduction 2
(This is credited to Alan Roberts from BBC)

In post I crush the XF100's blacks a little to match the 5DIII, and I may increase the gamma some to match the 5DIII. For both cameras, I sharpen as appropriate for the scene. And I've been able to get a good match.