I never had a battery life issue with any version of iOS.
I can’t say that for iOS 10.3.2. Something simply drains the battery in my iPhone 6 even when I’m not using it. Using apps is just worse.
I read that others have battery life issues, too.
I also had the issue where the Usage and Standby time were the same. I turned off the phone and the issue was gone.
I think that iOS 10.3.2 doesn’t work as expected, at least for me. So I’m waiting for iOS 10.3.3 and hopefully fixes the battery drain issue.