I noticed that compressed raw real time preview on 12 bit and 10 bit was darker on the screen and thus harder to use for framing and focusing on the eos m. I made this picture style to use as a viewer for 10 bit compressed raw. it brightens up the image to where its usable in my opinion. if anyone wants it heres a link to download. use just like any canon picture style.
https://drive.google.com/file/d/0B_4dpBYObDvEaHJ1LW5WR3hBLWs/view?usp=sharing
https://drive.google.com/file/d/0B_4dpBYObDvEaHJ1LW5WR3hBLWs/view?usp=sharing