Love, love, LOVE the passcode entry screen - the buttons are way bigger and no more accidentally hitting the delete key instead of a number (because they took out that delete key completely -- maybe a bad thing?). Anyways, keying-in that passcode is SO much easier for me now.

Really like the zoom animations on everything. Like that there are no longer bars but dots for phone signal quality -- I think the bars were a bit counter-intuitive and sending the wrong signal (see what I did there?) as to what the bars really measured. Although I do note there's no longer an indicator of what kind of network you're using (LTE, 3G, etc.) -- at least, I haven't seen one yet ...

There's a lot of little other things -- overall pretty happy so far. But then, I really don't use my phone for too much other than as a phone, alarm clock, camera and mail. Not really into the massive amounts of apps and stuff.