Thank you everyone for your input! I am still undecided so I am renting the A7s for the weekend and will run some tests with magic lantern on my 7D to see what I like best. :)
Using a different analogy, would you say that the 5d is like an English Bulldog while the A7s is like an afghan greyhound?
Thank you Ezi, this is probably the most helpful thing I have read so far! :)
I shoot a mix of narrative and documentary but skin is super important, as is the ability to shoot great stills... I am very intrigued by ML but also a little bit scared that I will have to compromise to shooting H264 if I have to do a doc. I guess in an ideal world, I could get both and use the Mk iii for my narrative projects and photographs and the a7 for docs. :(