Gheorghiu's tone is more beautiful than Callas' but the latter remains totally unique. Not necessary to make comparisons because both are supreme in their own way.
This interpretation is totally different to that of Callas!! The timbre of the voice is also totally different! Both are excellent, of course. However, there IS yet another soprano who interpreted this aria in quite a superior way: Renata Tebaldi!!!! Listen to her!!!
+Pedro Gonçalves The rendition is from Angela's CD album "Homage to Maria Callas", which was released in November 2011. So most likely the actual recording took place in 2010, when Angela was 45.