Boy has this discussion gone way off topic for a while. I also like shooting documentaries with my EOS M1 and thought about what would happen if it could pass the broadcast test. I guess if the movie was compelling enough it wouldn't matter what it was shot on. Parts of Oscar winning docs were shot on iPhones and GoPros.
I wanted to comment about all those recommendations for the EOS C100. It is a great documentary camera but it doesn't shoot 4:2:2. You can add an external recorder but then you can also do that with the EOS M, though it isn't really all that practical--you need Magic Lantern for a clean output and the camera's LCD blanks out when an external HDMI monitor is connected. In addition, it doesn't put out a 1920x1080 signal, it is slightly smaller so it needs to be blown up in post. Still, it should work and it would give most of the portability of the M while still delivering an acceptable 4:2:2 signal. There's something to be said about using what you're comfortable with.
Of course a C100 with an external recorder would be better and a C300 with or without an external recorder even better. After using a "real" cine camera it might spoil your appetite for DSLR's.