Not the first time battery drain issues pop up with ios update. They should have learned from past and make better testing before releasing any update.
Just got rid of my iphone, S3 and Droid are Way Better.
Get a solid 2 days use out of 1 charge.
oooh yeah you can swap batteries and add more storage too, extra 32GB for £18 !!
Wont be going back to Apple anytime soon.