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It's so hard to tell when switching, but even after restoring from my backup of my 6s Plus my 7 Plus is getting incredible battery life. Easily seeing 2 or more hours of additional usage time on the 7.

Now sure that may just be the benefit of a fresh battery over a year old one, but either way I am very happy with the 7 Plus battery wise.
 
I'm seeing maybe an 1-1.5hr usage difference. I restored from backup and reset all settings tonight to see if it will improve.
 
Mine is better, but a lot of that could just be a brand new battery. I'd say with similar usage I have an extra 10-15% of battery at the end of the day.

I'm still charging nightly, however.
 
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