This is a quote from an article about Anna Netrebko in the New York Times:
What about the ne plus ultra of the soprano repertory, Bellini’s “Norma”?
“That’s what everybody says, but it is so hard!” she said. “And it has to be sung absolutely perfect. I was recently in the Met store, I came in there, and somebody was singing Norma just perfect! I cannot say any bad word about this singing. I said, who is this? Joan Sutherland.”
But, this anti-diva added, she does not listen to Ms. Sutherland when she is working on a role. Rather, she turns to Mirella Freni, Renata Scotto or Callas. Ms. Sutherland “is a completely different way of singing, and different technique,” she said. “I don’t know how she’s singing. It’s just like flute playing. Perfect sound, beautiful, everything is free. I think this is a voice, one in a century like that.”
Dr.B: She is amazingly self aware, blurts right out that her technique isn't good enough for certain things. When someone is so up front and honest about themself, one feels no inclination to give advice. There is more than one way to handle coloratura, to place the voice for coloratura, and Anna knows this. It's a matter of taste that you reject one and love the other.