Here is a comparison - side by side - of Windows 8 and Ubuntu in Virtualbox (done in Linux).
On a personal note I think this is the most flattering comparison for Windows 8 - since I think that Ubuntu Unity is really bad....On a desktop.
But since both systems clearly have cell phones in mind - the comparison does make sense.
Manjaro 64bit on the main box -Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz and nVidia Corporation GT200b [GeForce GTX 275] (rev a1. + Centos on the server - Arch on the laptop. "There are no stupid questions - Only stupid answers!"