I assume you are referring to the α7R ii and In that budget class I would get something different entirely. Sony is good but if it's 4K video you are after I'd personally sooner get either something different. One of the reasons is because Sony shoots at UHD and I prefer Cinema 4K resolution if I have the choice. I had a quick look and I would probably get something like a Panasonic HC-X1000 4K that is built for the job and can even do UHD at 59.94 fps if you ever want to make things go slow at the cost of a little bit of pixel hight. An other great option would be the Blackmagic Production Camera 4K with an EF mount so you can use your current Canon EF lenses and those lenses from that kit you mentioned.
In regards to lighting I suspect you can probably do with a lot cheaper opportunities depending on your intentions with them. All in all your initial choices discombobulate me a bit but if you only gave me a choice between a α7R ii and a α7S ii I would go for the α7R ii.
Hope this is somehow useful to you. Also I did not do a complete research on all the options available at that budget so there might be a better fit. These examples are merely to show that although the "stats" of the Sony are nice there is a very high chance that there is a better fit for your needs out there.
The cats are watching us...