Just wondering what experience you had with VoD if you went that route and do you think it was worth it?
I'm looking into something similar myself.
I'd agree with Jonathan. The G7 from everything I've seen about it gets rave reviews and from all the tests it's seems quite a good camera, some even saying it is comparable to the GH4 picture wise.
I think you should definitely add it to your choices.
I forgot about the APS-C option. It's a great camera. When it comes to shooting 4K you can always buy or rent the Atomos Shogun when you eventually need it.
Enjoy the kit when you get it.
The a7rii on paper looks great but I haven't seen it in action besides the odd tester taking photos so I can't really comment but I'd imagine it's like the a7s but with internal 4k recording and a couple of other small upgrades.
It's very small which is great for on the move shooting. If you want to use lenses you already have you'll need the Metabones adaptor at about $400. (Or a cheap knock off adaptor)
The need for full frame is a fair bit over-rated in my opinion. It really just affects the focal length/field of view of the lens e.g 25mm is 50mm/ 50mm is 100mm and so on.. It's a 2 times crop from 'full frame' to m43. Another thing it affects is the depth of field making it a bit wider but you can get great shallow depth of field with the m43 through camera placement. Another FF advantage is low light but if you're lighting it won't be an issue.
I had the same predicament as yourself with the GH4 vs a7s and I thought the GH4 was just better for me. I didn't think the extra money was worth it for the a7s as the features I would have gained (low light) I wouldn't have needed. I got some high speed cards and lenses instead.
I would write down the pros and cons of each camera and see which one suits you best.
Both cameras have their pros and cons. It really depends on your shooting style. For music videos and short films it wouldn't really matter which camera as you'd most likely be lighting up properly.
For documentaries the GH4 is great for it's wider DoF to catch all action with no focusing issues. The a7s is brilliant for low light shooting so it would really depend on the content of the documentaries and what you'd need.
What type of docs do you plan on shooting?
Also with the GH4 you have almost an endless supply of lenses because of the sensor size and adaptors so you could most likely use the lenses you already have.