iOS imo works a lot better with the iPhone hardware than Android with the Galaxy S3.
Even Google (Android) admitted the software bottlenecks the S3, it's probably only using 40% - 50% of it's CPU power in the OS. While Apple's hardware and software utilize each other a lot better. That's why iOS in my experience is a lot smoother than Android, the Apple app store is also not so much cluttered with "crap apps". Today it's not about what phone has the best specs inside, but more on Internet Speed, etc. I'm glad they didn't make the screen size too large, it's a phone, it's suppose to be easy to type on with one hand and not become too large for your pocket.
Before you say I'm an Apple Fanboy. I currently have an Android device, and have experience with iPhone as well - but I am a fanboy, because they are better ?
That being said, Samsung makes solid phones, really, but they don't work as well together with Android (may be Google's fault).
So let's recap, what does this thing have?
1. Screen size of 4 inch
2. Slightly thinner body
3. Similar looks to the iPhone 4s
4. Aluminium back
5. A new "improved" dock connector.
What a load of pants! And I can already see the Apple junkies frothing at the mouths.
Remember the A6 processor, upgraded camera and so on ?