The only reason to drop the S3 for the Nexus 4 really is pure android/timely updates.
Maybe the build too cause I think the S3 looks ugly as sin! But that is my opinion.
Aye the reason I wanted to was that I still have a year and half on contract with s3 jut it really isn't a good looking phone and does lag in some games etc. Nexus so cheap I can trade in s3 and put like to 40 towards a better looking phone that was meant to be more powerful.
But apparently as pointed out the nexus had corners cut in the build quality and components and screen keeps getting slammed. Also performance wise is falling though that's benchmarks and I still have hopes would run games better than s3. Also wireless charging etc is a plus so can get the new phone feeling to play out rest of contract. Just now people getting them and putting up impressions I am not as confident in the change as I was..
I dunno, I still have order placed At mo