And I suppose the iPhone 5S will be an even bigger upgrade when that comes out. I honestly can't see your reasoning behind it being the biggest upgrade yet. If any of the iPhones was the biggest then in my eyes it was the transition from the 3GS to the 4. But this is turning into a completely different discussion now. At the end of the day, in my opinion, whether its the biggest upgrade or not, I can't see how most people can justify paying the money to upgrade to an iPhone 5 if you already own the 4S.
I'm inclined to agree. This is the first time in the history of the iPhone that the previous iPhone can do everything the new iPhone can do. The 4S can literally do everything the 5 does except have 5 rows of icons.
The only reason I'm considering upgrading is so that I can get on the new release 2 year cycle instead of the S cycle but then again, I can do that with the iPhone 6.