I have just received this bluray and compared to the Bayreuther Festspiele with Barenbiom and Johanna Meir in DVD,I found that the the image on the bluray is much better ( obviously ). Also the sound is fuller. Comparing Gwyneth Jones as Isolde on bluray with Johanna Meier,I found that Gwyneth Jones has a stronger and more melodic voice. . My only caveat is that she looks too old for the role. But you can Always turn off the vídeo.