My 11PM was still at 100% after a year. My 12PM is at 92%. I've actually used it less as I haven't been able to take my yearly trip to Japan where I normally take a TON of photos. The battery life is very noticeably worse. I work all day and don't use my phone. It just sits in my pocket. On my 11PM by the time I'm off work, it would have drained maybe 10%. 12PM it's down 25%. These batteries suck.
That´s the same for me, my 12 PM have 85% health in 14 months of use.
the real duration has dropped by 30% a day at least