It depends on what you want. I've shot two short films, one with a Blackmagic 4K, and one with a Sony A7s. I also use a Sony FS5 and FS7 for my day job. Working with both cameras was great for each film. It depends on your needs:
If you need low-light capabilities, go with the Sony. Blackmagic...
I hadn't used my computer in a few weeks, and it was time to plug everything back in and start using it again.
ASUS X99-A/USB 3.1 ATX DDR4 3300
Intel Core i7-6800K
Nvidia GeForce GTX 1070 Founders Edition
G.SKILL TridentZ RGB Series 16GB (2 x 8GB) 288-Pin DDR4 2400MHz
EVGA SuperNOVA 650 G1, 80+...