As someone who also is coming from the iOS side (phone, not iPad Pro), I pretty much share all of the uses listed here as reasons why I crossed the aisle to the Note series.
Yes, Android has improved significantly and many 3rd party apps work just as well on either platform, but the Note offers the ability to manipulate, interact with and bridge the gap between the digital & real world in a much more refined way (particularly because of the S Pen) than other devices.
That being said, and I'll respectfully disagree with Shanghaichica, my iPad Pro (with Apple Pencil) will be even more of an asset for me because it now has someone to play with on the same or even higher level.