Recently rented a 7D2 for evaluation. When I first received it, and was spending time setting it up in a similar fashion to my 7DC, it did seem as if the battery discharged quickly. Recharged it, went out and used if for some fall bird photography, performance was better. Recharged it and shot indoor sports for about 3hrs one evening, only reviewing pictures during lulls to cull out obvious rejections, and the performance was much better. About 800 to 900 shots on a charge, this is using 70-200 with IS on, so there is that additional battery drain. All shooting was done in RAW.
My conclusion is that is does use more battery power, but in a real shoot you should be able to get by, it isn't a battery hog to the point of constraining you.