I have both a Blu-ray and HD-DVD player. I got copies of The Kingdom, Serenity and Blood Diamond on both formats. I ran a comparison of all three copies using Hdmi output. I set both players to their default video settings. I felt that the BD looked a little richer in texture and color during the action sequences in Serenity. However, I could not distinguish any noticeable differences with The Kingdom. Both seemed almost identical to the other. Nor did I notice any huge change in pic quality when viewing blood diamond. Bottom line they both look great.