So you just recently and impatiently updated your device to the Galaxy S6 and are starting to regret your hasty decision. No worries XDA developers have ported the Galaxy Note 5 rom over to the Galaxy S6! You will need to be bootloader unlocked with custom recovery installed. You will need both the rom and the custom kernel to go with it. Wipe data and flash both files in recovery.
This will give you access to the updated camera app and other features like sidesync. Head to the link below for the downloads links.
Note 5 Rom
Note 5 Kernel