Great equipment doesn't mean a great video, but having it makes it a whole lot easier to create great content. This is the equipment I use.
My Mac together with my iPhone is the most important tool I have, if I have those two I can still do most of my work.
90% of my videos are filmed at a location that is not my office, so when getting a camera it was incredible important for me to get something I can always have in my bag, can produce high quality video, and work without having to run around with a lighting setup. And let me tell you, the a7s II is a low light beast, small and gives me incredible quality.