ARM cortex A9 500Mhz cortex Vs Atom 1.6Ghz CPU performance

Here a video spotted comparing the ARM cortex-A9 CPU with the Intel Atom 1.6Ghz one browsing web performance.

So what's interesting is that the ARM cortex-A9 CPU running at a low clock speed @ only 500Mhz, while the Intel Atom is @ 1.6Ghz clock speed inside a netbook PC, booth chipsets are close and you can imagine the future of coming Cortex mobile or desktop CPUs, so the question here will ARM CPUs lead the mobile or even the desktop PC market ?
Check out the comparison video: