Yea, it's getting pretty obvious that the battery issues for various phones are one off issues. Every time I hear about battery life issues for any phone, I just roll my eyes.
I don't think they are one off issues.
There are more variables in android world. All of us are likely running different firmware roms from the manufacturer and therefore there can be differences between regions / carriers despite the phone being the same.
I still only get 2.5-3 hours SOT over a decent 15-16 hour on battery day. Sure I can push it to 4 hours over maybe 8-12 hour on battery, but I never get anything like any of the results some are posting with 5-6 hours SOT.
I have an unbranded european XEU CSC model S6 Edge - and even despite having very latest update yesterday and running with the device today again as my daily driver - I'm still not getting any battery improvements.
There are other variables at play though such as I can not get LTE here and so we only have 2G / 3G with signal hopping between then. So that could also contribute a difference to my performance with the device compared to someone with exactly same phone / firmware but living in an urban area with decent signal / 4G LTE.
That being said - none of my other devices are impacted by being in a rural area with often low signal - so do wonder why the S6 would be impacted other than possibly the samsung modem inside the device is less efficient in lower signal areas.
That being said - call quality / reception despite that seems solid on the S6 Edge, compared to say my HTC M9 which though doesn't have the battery or ram issues my S6 Edge does - drops calls when the likes of the S6 edge and iPhone 6+ & Nexus 6 all manage to stay connected.
So there are ups and downs with the device - that may not be exactly one offs - but certainly individual experience can vary greatly.
SOT & Battery I could live with - it still gets me through a day - sadly the aggressive ram issue - despite running with the new update to fix it - doesn't appear to have made much of a difference, I'm still getting frequent refreshes.