Originally Posted by Scottnot

The content on the BD DVD, however, must be scaled from 1080p to 480i by the BD player in order to be displayed on the 1080i set.
It is unlikely that the scaler in the BD player will be as good as the mastering equipment that was used to manufacture the SD DVD, so it follows that the BD DVD on a "standard 480i set" may look worse; or it may look the same; but there is no reason why it can possibly look better than the "well mastered" SD DVD.