Yes, I have always recommended "The Discarded Image" for anyone reading in the Renaissance. It's an excellent book.
I'm particularly impressed by his turn for the pithy phrase that summarizes a concept or gives you a "hook" to remember a writer by. He is very hard on the authors of the mid-sixteenth century (he calls it "The Drab Age") and he skewers them right and left. One poor soul has a work doubtfully attributed to him; Lewis comments that if it wasn't written by him it was written by someone just as bad. Ouch!