Lmao "fake" S4...
Google wasn't trying to make an S4, or to even compete with the next generation of the Galaxy line; they wanted to make a high end Nexus device with a low price point so they can gain a higher userbase in their ecosystem rather than giving Apple a chance to herd more people into their's.
It's really not about which is the better device, the S3 or the N4, but rather which device is more suitable. I love the S3 because of its screen size, microSD slot, and the screen saturation. On the other hand, I'd jump at the chance to try out a Nexus 4 because it's pure vanilla with a sharper screen, pure black slate at the front with no branding or logos, and the build quality looks to be able to provide a very premium feel.
Samsung Galaxy S3 SGH-T999V