RED and Ursa Mini will both have Prores codex and compression option. Kinemax uses a proprietary program to transcode into Prores. If you're used to editing and grading Blackmagic RAW and Prores files then you'll not be surprised using RED or the Ursa Mini.

Image wise, the only thing I've seen better then Kinemax is Arri footage. That's it. If you can adapt your current computer and workflow for RED or the 4.5K files of the Mini then you can do it for Kinemax too.

Personally, my clients are happy with the image I'm getting from my Blackmagic and RED cameras. I have a workflow that works and a computer to crunch the bit rates and file sizes. Kinemax will be a non-starter for me.

*SPOILERS*
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Also, if we're talking about symbology, the struggle of Emily Blunt's character, we see at the end that she is forced to sign the document while her own police issue firearm is pressed under her chin.

Get the Sony. Just do it.
Don't compare anymore because from what you've said above, the Sony is what you need.

Bigger pixels = better low light. That's it. That's why the A7sII (at 12mp) beats the A7RII (at 40mp or whatever it is).

Also, camera manufacturers have to pay higher taxes on 'cinema' cameras vs DSLRs. Adding all the cinema features built around the A7SII sensor in a cinema body will require higher taxes, thus a higher retail price. You can't have your cake and eat it too.

Thank you for your opinion, Ed. We'll agree to disagree like gentleman. Cheers!

Yes I'm serious, Sean. I'm not joking. I'm not impressed with the image. It's okay for me to feel that way.