I upgraded from a Note 3. I was soooo ready for a much better camera because I like taking pics of the kids/family at any old moment practically daily. Much better low light capabilities, and camera startup and picture taking is incredibly fast.
Also, today for the first time I used Samsung Pay, and I used it at a magnetic swipe card terminal. It worked like a charm. The clerk was doubtful it would work, and then was astonished when it did. I think Samsung was brilliant to build their solution to be able to work with legacy magnetic swipe card terminals, which are practically everywhere already, in addition to the up and coming NFC equipment.
Also, having 64GB of internal storage, UFS fast storage, compared with the Note 3's 32GB, is also a welcome upgrade. I have a 128GB microSD that was in the Note 3, but even so, just normal application storage consumption, with all the apps I'd come to have installed and wanted, was making that 32GB an ever tightening squeeze.
One more thing I'll mention. The IP68 dust and waterproofing. I gave up on keeping the proximity sensor in my Note 3 in working order. After just a few months of living in my pocket all the time, lint and such would work it's way inside the phone and obscure the sensor, making it inoperative. I took the phone apart several times to clean it out, but then I just gave up on it. Without the working proximity sensor, the phone would shut the screen down when I brought it up to my ear to speak on a phone call, but then never turn the screen back on when I took it away from my head, unless I pushed the home key. An annoyance. I'm also glad I no longer have to be concerned about the possibility of calamity if I ever did get the device wet somehow.
The fast charging mode is also noticeably helpful. It's faster enough that you really can tolerate much better the amount of wait time to get yourself charged back up to 100%. It's an hour or so, versus several hours.
I was really hoping for 6GB of RAM, 128GB of internal storage, and a much bigger battery in the Note 7. While I didn't get those things, I still am pretty happy with what I did get, and will look forward to those other performance leaps forward on the next go around, hopefully.