I'd be shocked if the S6 or S6 Edge didn't have better battery life than my Nexus 6. Smaller screen, newer and more efficient display, much more efficient CPU, DDR4 RAM, UFS storage, and this new Broadcomm chip are going to go a long way.
I personally haven't been this excited for a device in a long, long time. I watched Phone Arena's speed test with the iPhone 6 and even the UI is significantly faster than before. If someone creates a Google Now theme for Touchwiz and you can replace the stock icons, there's going to be a lot of people converting to this phone. Especially the Edge.
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Agreed. From what I've heard, the Nexus 6's battery life is easy to beat.