Everyone seems to be going for the A7s, the 5D still has a great look and is very reliable - but the A7s image is hailed as superior by most.
Looks interesting, fun for consumers but not great for pro's.
There are loads of cool film looks in plugins such as Magic Bullet Looks - worth checking them out.
Best of luck with your campaign!
I can imagine how frustrating that was! Glad you shared your experience so others can find this when they're doing their research :)
Looking for 'test' footage of new cameras will usually bring up some ungraded footage. I often see people post a Vimeo link on forums, then a download link to the RAW files later after people ask.