I've replaced a LOT of my older DVD's with blu-rays. There is usually a big difference in quality. I visited that comparison last night with the movies AI and X-men United. One of the biggest differences I noticed last night was the DVD had a ghost image around objects that were only visible when you were looking for them. Like just next to the face and ears of someone's head. It was very near the object which makes it harder to see, unless you were friendly and up close. This is one of the things that makes the DVD images a little blurrier. On blu-ray, these ghost images were not there.
