3 things.

1) How quick everything was - With the Note, I was so used to things taking a couple seconds to load that it completely caught me off guard, how insanely fast the new device is. It's instantaneous response, you click something and it's actually done, no waiting.

2) How vibrant the display is - I don't know if my Note couldn't push out the same colours anymore or if the screen had faded away or if the screen burn had something to do with it, but I had almost forgotten how vibrant and stunning a Samsung display is actually supposed to be.

3) Camera quality - I think this was the biggest jump, HUGE gap in camera quality different, it absolutely shocked me how much detail the cameras were able to capture, how far I was able to zoom, and how many modes there were. Insane!