It is indeed a very powerful voice, entirely understandably he now already is seen as one with the best voices. In the opera world, he will be classified as an tenor altino:
It is a type of tenor voice with a compass not much wider than that of the coeval baritenor, but able to sustain far higher tessiture.
It means that the basic range remained substantially the classic one, from C₃ to C₅: only the best baritenors, however, were able to reach up to such heights and used to pass anyway to the falsettone (or strengthened falsetto) register about on G₄; for tenori contraltini, on the other hand, the threshold of the passage to the falsettone register rose a tone/a tone and a half, and they could so easily reach C₅ but often up to E₅, or even, exceptionally, to F₅.
The real difference, however, consisted in the tessitura, or the pitch range that most frequently occurs within the given piece of music and where the artist is called upon to execute syllabic singing with the best sound results.