I have always been told that Yquem is never decanted because it must shine in its bottle.
One day I saw in a popular magazine that Bernard Arnault had bought Yquem and on a double page there was a picture of him having in hand an Yquem which was in a carafe, the empty bottle was on the side.
I thought : he knows nothing.
Some months later I went to Château d’Yquem and had a lunch with Alexandre de Lur Saluces and he served a 1948 Yquem in a ugly multi faceted carafe.
It was as if I had a knife in my heart. But Alexandre is Alexandre !
Anyway even disapointed by this, I continue not to decant any Sauternes, because for me a Sauternes has never to be decanted, whatever good reasons would exist.
Sauternes is Sauternes and is not decanted.
I would say that I do the same for every old sweet wines.