Ralph Wood gave a lecture for Big Ideas contrasting J. R. R. Tolkien and C. S. Lewis. Wood begins his lecture by explaining that though the two men have much in common, this commonality has been emphasized to the point of concealing some of their differences.
One way Tolkien and Lewis differed was in their writing processes. Tolkien would revise, revise, and revise. Friends would take papers from him and publish them to break the editing cycles. Lewis, on the other hand, would send first drafts to the publisher and later make only minor corrections to the proofs. Wood also discusses much deeper differences between the two authors.
(Big Ideas makes it difficult to link to show notes for individual podcast episodes. Here’s a link to the audio of Wood’s lecture.)