I got the new update little less than a week ago (At&t) and I'm pretty disappointed. Might be my fault though; but from what I understood there was suppose to be a decent change in some of the UI and aesthetics. All I got was a different battery icon and when I play songs from BeatsMusic my phone displays the full album cover stretched out (very nicely done) over the lock screen. Other than that I'm pretty disappointed with kitkat for the sgs4.... So far.
I updated yesterday. I have an AT&T HTC ONE that I'm using on Straight Talk. Now my mms isn't working at all. 3 hours with the amazing technical support of straight talk (i hope you catch that sarcasm) and still no help. I have the new 4g LTE sim card with the new APN settings that go with it and it just don't send or receive pictures in messaging or hangouts since updating to kitkat. Any one else had a issue with mms working after updating?