image quality is imho more beautiful than the a7s. Robust and durable.
Very nice color profiles + you can tweak it.
Good low light performance
Built in ND filters
Excellent battery life!!!!
No slow mo (only 60i)
AVCHD (it's not so bad. I just don't like it, personally. You can pair it with an external recorder though)
Needs a rig/cage if you're using an external recorder.
Eye piece sucks dog balls.
Light, small, discrete
Full frame sensor + aps-c mode. (I found this helps if you have limited lens choices)
Mind blowing low light capability
Custom color profiles
Great viewfinder (I find it better than the LCD screen)
If you have a ronin/movi, won't drain the gimbal's battery that fast since it's light.
4k with external recorder
Colors are not so good on the get go. Needs tweaking.
Heats up a lot.
Battery life isn't so good.
Not very balanced when mounted to a tripod. (Can be fixed by using a rig/kit/meta bones lens adaptor)
Image quality is a little duller compared to the c100 but nevertheless looks great if you know what you're doing.