I have no doubt the battery will be excellent. But everyone's usage is different. The biggest battery drain is tower signals. you'll get people that say the battery life is trash and then get people who live it. Best to just go off your experience.
There will be plenty more of these with the Qualcomm chip soon enough, no worries.The chipset is the Exynos version, so Qualcomm users really have no skin in this test.