The hardware, down to the sturdy casing, sturdy build is wonderful to behold.
As you can see the sturdy build of the Note 4, the squarer edges, the button, volume rockers, and the S Pen, makes for solidity.
2. Software: Android.
The Note 4 comes with Android 4.4.4. You may be disappointed by the lack of Lollipop. LG has already pushed 2 Lollipop updates, but Samsung seems to be hinting at bypassing 5.0 to go to 5.0.1. The lack of Lollipop seems to be made up by a quality and polished up Touchwiz. Not only that but polished up Android experience.
3. S Pen functionality
Simply superb copy and paste functionality, and able to minimize the apps to be smaller, copying off media, text, images. Making it a pleasurable and interactive experience.
Simply put....a excellent must for any mobile business person.
Comes with 3GB of RAM and 32GB of internal memory. With expansion SD Card functionality option. This makes up for a speedy OS experience.
Note 4 comes with the Snapdragon 805 clocked at 2.5GHZ. This means coupled with a GPU of the Adreno 320 means you can get a lag free experience.
6. OS Updates
The Note 4 has had an update to its Google engine. Other tweaks also. It is estimated that this month there will be an Android 5.0.1 accross the board.