I have the original with all the dlc's. Is this game really worth it just for the graphics (I always play on max graphics) or does it add more content as well? Also, does it include the dlc content in it?
It doesn't add any content other than what you already have. It brings improved graphics and 64bit .exe which allows the game to access more memory and thus provide more stability. I loaded Skyrim LE with graphics mods and compared it to Skyrim SE and it's not even a fair match. SE looks much better in my opinion, it runs better and smoother. And yes, all the content of the vanilla Skyrim/Oldrim and its DLCs are in Skyrim SE. Hence why the "update" is only available to people who own everything.