so far the geekbench battery test is the only benchmark to show a difference, they didn't test it as they don't use it, they did mention the results others have gotten from it and at this point I think there is enough evidence that you can assume results will be similar even if they did run it.
http://www.tomshardware.com/reviews/how-we-test-smartphones-tablets,3894.html
every single other benchmark on anandtech and tom's hardware is nearly identical. you can't just ignore that and keep throwing one benchmark at people while saying the others don't count, check the geekbench chart, there are devices with strange results all over it, like the Galaxy S6 which definitely does not have better battery life then the 6 Plus in real life
every other benchmark seems to back Apple's claims that they perform very close to each other in real life and it seems it's down more to the silicon lottery then which chip you have, a couple of posters on here have returned Samsung devices and gotten TSMC devices and say they have worse battery life.