I have to say it is noticeably faster than the iP4S. I haven't had much time to shoot photos, but for basic tasks, it really is faster. The fact that it's so light, with a bigger screen that also has much better color saturation, is great. The new headphones are also a huge step in the right direction. I'm not one to use headphones for music, but tried them yesterday and heard things I haven't heard in my music for years. They both fit my ears better than the old buds, which I haven't used for at least the last 2 years, and sound much better.
I still won't use them, except for those times I'm flying, but I'll be sure to pack them for my business trips now - something I haven't done for years with the old buds.