Quick question regarding Auto-Focus:
If your subject is moving, how do you keep the focus on at all times? Does this have to be done manually?
Most common method is using a follow focus. Manfrotto makes a remote that hooks up to the camera via USB that will allow you to focus and do a few other things, but I don't know that I'd trust it to do what I want. You definitely need to have a solid monitor/EVF and be very careful. I have a couple Marshall monitors, but I prefer my Zacuto EVF because it has a peaking feature, which essentially artificially sharpens what I'm seeing so it's very easy to tell when it's in focus.
Finding a good way to focus is critical, because unless you're shooting at like f/8 or higher you're going to have a lot of trouble with it. Shooting with the aperture opened up makes the DOF very shallow, which is probably the most difficult situation to focus in. At f/2 on your 50mm if someone moves their head forward even a few inches they may suddenly be out of focus.
Generally the motion picture industry spends lots of time setting focus marks and measuring exact distances to be really precise, so focusing is a lot more work and a lot more important than it may seem initially.
And a word of advice, be careful judging based on the camera's built-in screen. I can't tell you how many people I've seen think that the footage looked great looking on the little screen but then they got it open on the computer and it was a totally different story.