Also known as Manga Studio 5, which is published by Smith Micro as a boxed version, Clip Studio Paint is the digital version. This is the English version straight from Celsys, although I hear the Japanese version is more up to date (and with actual english fans translating it!)
For illustrations, it's an excellent alternative to Photoshop but at a way cheaper price and optimised for touch.
Only difference I can see compared to the EX version is a few features that would only be important to manga/comic artists where you would need multiple pages and panels.
thanks (cant draw, but I own a version of manga studio aswell)