I like to do this, myself. I'll watch different adaptations or related movies consecutively in order to compare them, as well as to just keep the theme going and check them off of my list. In fact, after watching The Private Life of Henry VIII the other night, I learned of another film made 20 years later, in which Charles Laughton reprises his role as Henry VIII in a story about the young life of Queen Elizabeth, so I'm watching that right now. Having a point of reference, whether it be an earlier adaptation, a common character or something else, gives extra incentive and enjoyment to watching a film, I find.