No. Save for the appendices, K & R can be completed and understood in a weekend. It's kind of fun to read and to work through the problems, even if you rarely use C. The Sepples book, on the other hand, is an encyclopedia. I don't know why anyone would want to read that unless he had to.

In 2016, however, I think that a lot of people would have read CLRS, even if they haven't read ALL of it. It's used as the reference text by a lot of university courses on algorithms.