I won't take the time to post pics, but completing my data set I get the following: ASM vol 2 = 5.8 cm; IM = 5 cm; Capt A = 4.9 cm. Those measurements include both text block and the cover since that's what takes up shelf space. Captain America has the thickest paper and has about 60 fewer pages than Iron Man, while Spidey has about 60 more pages than Iron Man with a paper that feels heavier than Iron Man's. Since there's not more than a centimeter's difference between the three books, I'd vote for nicer paper and more bookshelves over thinner paper!