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I realize there is a huge difference between usage hrs and standby hrs...
To clarify, I would say in a normal 3 hr period where there is moderate texting and maybe a phone call or two... what I consider normal usage. Not surfing the Internet using my iPhone.... anyway just observing my battery life under those conditions with iOS9 my battery would drain quickly. I was amazed by just how much. Looking at my apps, it was showing safari around 45% and messages being close to 60% with other apps like Waze being around 20%... with the software/firmware update messages now show up at 23% (still texting people normally), and Safari at 35%...battery level was at 75% this afternoon before I drove home.
I'm sure its too soon to determine usage but my initial feel is that the battery seems to last much longer than it did when I had iOS9 installed.