Regardless though the merchant ARMy have nothing like the potential Cyclone has as they are already maxed out (or close to) on clockspeed
Looking at ARM's figures the ARM A57 at 1.8Ghz should be about the same as the iphone 5. The Nvidia Denver at 2.5Ghz should beat the iphone 6 and should be reasonable on power, we'll have to see how it compares on that when it comes out.