I've never looked at the mirrorless that way, I mean regarding the batteries. It's not that I want a mirrorless but I want a smaller camera. Also de Fuji ones look very cool, as well the Olympus, like the early 80s look of my Canon AE-1 (which does have a 50mm f/1.4 btw). I'm not a pro, I don't make a living out this so I can experiment a little without not being able to make rent.
I own a t3i I bought new and at a really good price a couple of years ago and at work we updated to an 80D, we use both for video most of the time.