Funny you should mention this. I was very high on the One X after trying it out a few times at AT&T. Ultimately I decided to pass for several reasons. This was before the multitasking issue was widely known.
Today I was at the mall with my gf and I spent a lot of time browsing in Safari as I let her do her thing. So I was getting pretty fed up with my small and bluish iPhone screen and decided to visit AT&T again in the mall today. Even though the screen is superior to the iPhone 4/4S with respect to whites, brightness, and size, it's baffling how terrible Sense is on the One X. I wrote a short text message, opened the browser, copied a sentence from a website, went back to the text message, and my previous writing was gone. (The dreaded multitasking issue.) I also got a bizarre 'loading' message when I first exited the browser to reopen the text message.
I also have an issue with the font used in the browser. I used the stock browser and downloaded Boat browser and both rendered text in a font that looked inferior to what Safari provides. I also don't like the fact that you can't wake your phone by hitting the home button.
Anyways, it's things like that that make me feel Android still has a lot of catching up to do with the iPhone. I mean, the One X screen is remarkable, but there is much more to a phone than the screen itself. I too am excited about demoing the SIII. It's well known that the SIII screen produces a bluish hue in the browser, so I'm interested as to how blue exactly compared to the iPhone 4/4S. I also get the impression that TouchWiz is far better than Sense and of course you also get a physical home button, the expansion for 64 GB if desired via the SD slot, a more curved backing, etc.
As to what the OP is stating, well, I think the 4/4S is pretty tired at this point with respect to its hardware, but I can't think of an Android device that I feel is on par with it.