Why should I upgrade to a Lumia 920?

I was really jazzed about the Lumia 920 and I couldn't wait to upgrade, but then it took just a little too long to come out and I've had enough time to reconsider that maybe what I have is good enough already. I used someone else's 920 for about an hour the other day and the experience is largely identical to the Lumia 800 I've had since February (aside from the gargantuan screen), so what will really change about my daily use if I pony up for the upgrade? I love new toys but my budget is a little tight so I'm looking for someone to convince me it's necessary. :)