summitsoft sells clip art packs n all & I would bet that comic creator and anything summit sells will use .jpg's.probably have some png, tifs ,psd
I've never seen a CGI app that didn't have .jpg's

MS5 & MS5EX is the same app for graphics ones not better then the other. but EX is for multiple page comics. 
So MS5EX helps you make a multiple page comic .formatting,editing text on multiple pages all at once n all that editing books stuff.

the EX part has nothing to do with making Art .

 

============================================================ 

The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance