Things I discovered:
-Battery: my battery was conking out. It just seems the battery is better even with the bigger screen
-Bigger screen: speaking of which, it's an adjustment getting used to it. For my smaller hand, I feel the difference. Thankfully, it's taller and not wider. I don't look forward to the super sizing of the phone.
-Speed: oh hi A7 chip!
-64 GB: okay, maybe you won't get this size, but it's great for me. I've had to limit what I could put on the phone before.
-Camera: such a great camera and burst mode is great. The dual flash is nice. Slow motion hasn't really gotten a workout, but it'll come in handy.
-Touch sensor: it's a little picky and doesn't like a dry (e.g. frequent handwashing) or wet finger. When it works, you understand why samsung et al are seemingly gimmicky when it comes to their phones. I used a 5 digit pass code before and this is that much better.
-Siri: I use it to compose text messages when I'm driving (hands free laws). I need to learn to insert punctuation.
This isn't everything, but this is what I dug on.
