Will learning Ruby better give me a new perspective and reinforce my Java knowledge or will it just distract me?

I'll already need to learn extended ML for my functional programming class this semester (previously done haskell). I use php at work when doing front-end web dev. I wouldn't mind increasing my javascript skills also. So I'm afraid of being jack of all trades, master of none.

I know Java better than I think I do. It's all the libraries and frameworks that I need to become familiar with.