I'd like to offer my honest opinion as an iPhone 4 user.
It's so cute how much people drool over the already outdated iPhone 5. It came out shouting this and that about how great it is; flaunting nothing but old hardware, anorexic tendancys and a buggy "upgraded" OS - all the while phones like the S3 looked down at it from their perch of ACTUAL smartphone advancement, amused at it's false ideas of self superiority .
Don't mistake me for a long time Apple-hater. Ive owned the 3G and still own and use the 4. Once it used to be the best phone you could buy, and by a considerable margin too. It used to cut clearly through the other phones available and stand out from the crowd, at least in my opinion.
But sadly Apple isn't doing anything new or impressive anymore. Claiming it to being the thinnest and "most beautiful" is not an upgrade. There's nothing new - nothing cutting edge. People want proper upgrades for their money. A faster chip, and slightly taller screen, a new dock connecter, reduced weight - its all really quite poor. Sure it might be a good for someone who wants a new smartphone and isn't fussed about outdated technology - but thats it. This Lumia has eclipsed it in almost every facet and no-one can deny the usability of the redesigned OS. I personally feel it would be very refreshing.
Ive used the S3 too and it's a great phone to use. It immediately made my phone and its successors; the 4S and 5, look behind with the times.
I was very sorry to see the iPhone 5 rumours to be mostly true because they fell far short of what Apples new phone could have been. I like iOS, and as a Jailbreaker since day 1, ill be sorry to say goodbye to it as I find it to be unbelievably familiar and comfortable. I've always said that if I couldn't Jailbreak iOS, I wouldn't have an iPhone but now I feel like all that is a bit old and wearing. As proficient and practiced as I am at JB, I'd like to not have to go to the trouble of it to acquire and free up features that many other OS' and phones offer. For me and I'm sure for many others who want their dollars worth, the iPhone has lost its allure and leading appeal with the release of the 5 and iOS 6.
It has long been my opinion that Apple strongest point in it's software is its developer database. It's AppStore ecosystem is massive and well backed by many developers. It's clear that if the Windows OS does suffer from one particular deficiency, its the lack of such a vast developer front that the AppStore has, and the way to success is generating apps for the Lumia and OS.
Wireless charging, NFC, great internal hardware for power and impressively proven camera, a better screen almost every way and much more - the spec's speak for themselves and now the OS does too.
It's release only solidified my desire to go with a different phone maker, and right now the Lumia 920 is calling my name.