The positive side of reading other literary works is, seeing how someone who was successful, did it. How they made the reader care about the character, painted scenes with words that put you there, etc.
The negative, You also can become, and most do, a copycat. Sometimes it's good to be a copycat, and sometimes it isn't.
Take for instance JRR Tollkiens works. They didn't become popular until after his death. His fantasy world was a new realm that hadn't been uncovered previously, and the lord of the rings was not popular in the least, if you can believe that. Brilliant imagination.
Terry Brooks as much as admitted that after reading Tolkiens works he wrote the Sword of Shannara. The parallels are unmistakeable.
From Brook's Alanon/Tollkien Gandolf, to Shea Omhsford/Bilbo Baggins. And it doesn't stop there! The Shire/Shady vale, The unwillingness to go on an adventure, and the longing to return to what once was and knowing it never will be the same again. It's like watching a re-run evertime you pick up a book. Did it work for him, sure it did. Had we seen it before, yes. Are we still seeing it, yes. And we'll continue to see it. Tollkien imagined a whole new genre and he's still copied today from cranium to toenail.
I wish we had a new master imaginator in our world, instead of copycats on different colored horses.
So it's good to read as a writer,agreed. What we learn and employ....
Good luck in whatever you have in the works.
Ken