Well I've had my Note 3 for a few days now and I can say that it'll be extremely difficult (if at all possible) for me to go back to an iPhone, especially the current gen. Now if next year they make some kind of massive change to the iPhone 6 (or whatever it'll be called) then I'll think about it. But as of now, I couldn't go back to a 4" screen and lack of customization. I've gotten used to Android 4.3 already, it's just a matter of really digging into the phone to figure out all of the little features, which is the fun part. After owning 3 different iPhones, there wasn't much to figure out, it was plug & play. I'm loving the massive screen, the blazing fast processor and the camera is amazing.
I would highly recommend this phone for anybody looking for the latest and greatest.