I have tried CineStyle on the 5D3: it looks just like on the old cameras, and has exactly the same DR
I've been working on Flaat v2 for the 5D3, here's what I've found so far:
* the good news: picture styles for the old cameras work just as well on the 5D3; that includes CineStyle, and of course Flaat; cutting 5D3 and 5D2 footage shot with the same picture style should be similar to cutting 5D2 and 60D footage (at least in terms of light response and color: sharpness and false detail are obviously very different)
* the bad news: this means that, compared with my old APS-C canon, with the same picture style, dynamic range is basically the same; if the 5D3 has any extra DR to offer in video mode, it will require new picture styles
* the even worse news: it's not easy to get more dynamic range with picture styles; the information is there, I can see it playing with the RAW stills in DPP, but no matter how hard I fight with the picture style editor, so far 11.5 stops seems to be the limit; unless Canon gives us a new way to control how the RAW information from the sensor is converted to video footage, in video mode the 5D3 has exactly the same DR as the 60D or the old rebel
* the still unknown: even if DR is not any wider, useable DR may be better, given the 5D3's lower noise levels and hopefully improved codec; so if you have a 5D3, try Flaat_12p and let us know how it looks!
version 2.0 of my suite of Flaat picture styles is here:http://www.similaar.com/foto/flaat-picture-styles/index.html
you'll see there's a name change, now they are called by the number of stops of DR that they get:
Flaat_1 is now Flaat_09 (slightly modified)
Flaat_2 is now Flaat_10 (very slightly modified)
Flaat_3 is now Flaat_11 (very slightly modified)
Flaat_4 is now Flaat_12 (very slightly modified) (it doesn't get to 12 stops, but it's more than 11)
also, there are two sets of picture styles:
* one based on Portrait, for nice skin tones, but with some color shifts (e.g. blue goes a bit towards cyan)
* one based on Neutral, without those color shifts
I always use the ones based on Portrait, the others I only made them because some people wanted to avoid any color shifts. I'd rather have nice skin tones than correct blue, but it's your choice.