Those people that are saying Lion King was a rip-off of Kimba the Lion are only jaded anime otakus that seem to think American animation is always ripping off Japan.
Not true. In fact, The Lion King was an adaption of the famous Shakespearian play Hamlet where the main character(which the play is titled off of)'s father, the King, is killed by his jealous brother. Told by his father's ghost to avenge his death, Hamlet does so, the similarity ends with Disney's trademark happy ending (in Hamlet, everyone dies at the end).
This movie, though not my favorite of all the Disney animated features (that title belonging to The Hunchback of Notre Dame), is superbly made and has earned it's recognition as one of the greatest animated features of all time very easily. I'd go as far to say that if Walt were alive when it was released, he would have been proud.
The music, acting, animation and overall story are all blended together seamlessly into a movie you have to be completely abnormal not to love.
Buy this movie, you won't regret it, even after the upteenth viewing.