This is the definition of Cinestyle according to the official website of technicolor:
The Technicolor CineStyle ™ is a Picture Style (profile) for Canon EOS DSLR that optimizes the dynamic range image by leveraging the capabilities of Canon imaging chipset. Cinematographers and post-production partners will have greater flexibility in color grading and finishing your projects.
Many of you will wonder, to what extent this actually works, or just as does. Well Technicolor in partnership with Canon USA developed this profile that broadens the possibilities of post-production retouching through a series of mathematical processes, avoiding the color on a color PUSHing h264 log.
I will make a tutorial itself so you can see it really big advantage that gives us this color profile.
I hope your comments, or doubts.