what that means is the iphone 5's processor uses significantly less battery for the same or better performance. that means it can be thinner and lighter, and still run as long. differences between the 4s and 5 are easy to see when multitasking, or in battery life. my iphone 5 lasts significantly longer than my 4s did. enough that i don't need to worry about it at all for a day. that's a pretty big improvement to me.
if i were using an android phone, it would have to be much bigger and heavier to get through the same usage. i'm very much enjoying not having an awkward bulge in my pants all day. androids will soon start shipping with a15 based SOCs. while it will improve performance over the iphone 5, it's a server oriented chip that's going to be even bigger and hungrier.
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http://www.anandtech.com/show/6330/the-iphone-5-review/13
some of the best battery testing i've seen in a while.
I'd say that's a stretch as far as battery performance goes. There is much more too it then just cores and clock speed. In my experience with Android and a tegra 2 device I was able to gain performance and battery life by overclocking because I could undervolt it. Then you have a big factor of time to idle meaning the time it takes to get the process done then back to idle.
Idevices have always had a reputation of good battery life. But in my experience I'm always doing a lot more with my Xoom then my iPad for example. Widgets, live wallpapers, etc etc. And if I jailbreak and do those things the battery life becomes a lot more comparable.
Btw I'm trying to stay neutral as I have had good experiences with both devices.