Snapdragon 810 has regular ARM Cortex-A57 cores, because I guess Qualcomm didn't have their usual custom cores ready for 2015. In that regard there's nothing different between Qualcomm's SoC this year and what Samsung/Nvidia have been doing with bog-standard licensed ARM cores. This is a huge stumble for Qualcomm this year, because in previous years it was their superior custom designs which gave them the lead in thermal design and performance per watt.
The difference in 2015 is Samsung owns their own fabs and they are at 14nm process on Exynos 7420, they are going to just murder Snapdragon 810 in thermal design and performance per watt because 810 is at the same 20nm process everyone else who's IP-only are stuck at. And Samsung isn't going to share, if you want the best 64-bit phone SoC in 2015 you're going to have to buy a Galaxy S6 or Note 5.
Nvidia are the wild card here, they are announcing something on March 3rd and if it happens to be a new Tegra with the same goddamn ARM cores as Qualcomm and Samsung, but with a Maxwell-based GPU and the long-awaited integrated Icera software baseband/modem, they have finally accomplished what they have been working so hard at for more than half a decade and finally become the new Qualcomm. The new Tegra will murder every other ARM SoC in tablets when it comes to straight up performance, but as usual it will probably run too hot for anything but the largest phones. But hey, Qualcomm is running hot this year too, so it's as good an opportunity as Nvidia will ever have in this very competitive market.
I should sell my Qualcomm stock, come to think of it. This won't be a good year for them.