New 10.5" Pro here.
Not feeling the love. Not yet at least. About on par with my iPad Air 1 (which was more than adequite). Of course I've done nothing to maximize power draw, or look at my stats yet. But now I'm interested in this topic for the first time. No regrets though.
My old iPad 1 still has the best battery consumption out of all of the apple mobile products that have passed through my house. iPhone 6s a close second.
I'm expecting battery cycling and some conscious maximization of settings and useage to get me closer to what you folks are claiming.