First of all, what videos are you shooting? are they short films, vlogs, sports etc...

From what I read here, I'd suggest to stick with the 70D. It's already a very capable DSLR for videos. You've already invested in many Canon lenses so jumping to Sony will cost a lot more than just a new camera. Going with adapters is an option but AF won't be as good. But again, importance of AF performance depends on what kind of videos are you making.

Switching from photo to video is a lot more than just the camera. With your budget, consider to invest in these first if you haven't already:
- A good microphone / sound recorder. Most of the time, sound is more important than the video quality. Great sound quality with so-so videos are normally more watchable compared to amazing video quality but terrible sound.
- good headphone / speakers... else how can you know how good your recording is
- extra SD cards, hard drives. even 1080p will eat storage like crazy, 4k apa lagi
- stabilizers / gimbals
- tripod with fluid head, sliders, etc
- bags to carry all those video stuff

also...can consider a drone too... sorry too much poison haha. just that my opinion, these things bring a drastic improvement to videos compared to just a camera upgrade

Also, can get some ideas from this video by Simon Cade: https://www.youtube.com/watch?v=fLXQJtIu2xM

This post has been edited by dvlzplayground: Apr 24 2017, 07:44 PM