Rightly so. Just look at this
http://www.phonearena.com/news/Powe...l-smartphones-currently-on-the-market_id73040
This test shows that even if the Z3C/Z3/S6 Active/S6edge plus/S6edge/Note5 has the same 1810mAh size battery as the iPhone 6, they will still beat the iPhone 6 on battery life. What is shocking is that all has much larger screens and much higher resolutions(bar Z3c), more processor cores with higher clock speeds and much more RAM. And Android always has more thing running in the background and widgets too.
So where is the so-called iOS optimization?
Apple deserves to be singled out for criticism because they charge the highest price for less hardware and are so proud and arrogant that they feel they can just do whatever they want and consumers will still bite.