I think you have the right idea. I would take issue with the statement that novelists can expect their novel to be printed without edits. I don't think that is true. As for "compare for," it's almost as if there should be a comma after compare: "How do these forms of media compare, for the those involved in producing them?" "To compare for" is not a phrase that we use. In this case, "for those involved..." is another phrase that gives more detail about the first phrase. If you take the first phrase, "How do these forms of media compare?" without the second phrase, then you would answer that question quite differently. But in terms of the producers gives you a specific point of view to consider. A phrase that we do use commonly is "to compare to." You could rewrite the prompt with this phrase like this: "How do novels compare to screenplays for writers (those involved in producing them)?" I hope this helps.