The problem with the thin paper in the soft cover Masterworks is the bleeding, especially noticeable in the lighter color areas, 
and there are often dots of printed dirt on the pages, something not seen on the hardcover MM with thicker paper.

In this image for example, you can see the bleeding in the white area and the light blu sky and if you look carefully even in the red lettering.
keep in mind it is worse when actually holding up the pages

captainmarvel02012copy.jpg