blue ray adds high definition, or in star wars case remastered HD, it wont be as good as new hd movies but i must say once u get used to HD films the difference is pretty large when ur close to the tv, it just brings out the details more, blue rays are also more expensive becasue most come with the dvd and the blue ray, they do this becasue people may aciedently buy the blue ray thinkin its a dvd