Philosopher and writer Thomas Carlyle: "One singer in particular, called Coletti or some such name, seemed to me, by the cast of his face, by the tones of his voice, by his general bearing, so far as I could read it, to be a man of deep and ardent sensibilities, of delicate intuitions, just sympathies; originally an almost poetic soul, or man of genius, as we term it;"
Italian opera composer Giovanni Pacini, from his Memoires: "The celebrated Coletti in the role I entrusted him was not able to be surpassed by any other artist.
Even Paris, when my fortunate work was presented at the Theatre Italienne, proclaimed Coletti 'The Greatest', 'unreachable'."

From the nineteenth-century British music journal Musical World: "The faults we have to lay to his charge – for which of us is without them? –
are a want of colour in his expression, a monotony in the form of his cadences, and a method of reaching the high notes, which belongs to a bad school of singing."

Lexicographer Francesco Regli writes: "One observes with great astonishment the ease with which he executed the most difficult of roles, dramatic as well as those of agility, the extraordinary extension of his voice and the colour that is so indispensable in the various characters in the music."

Portraits of the three baritone rivals, by Josef Kriehuber, the viennese artist.
Philosopher and writer Thomas Carlyle: "One singer in particular, called Coletti or some such name, seemed to me, by the cast of his face, by the tones of his voice, by his general bearing, so far as I could read it, to be a man of deep and ardent sensibilities, of delicate intuitions, just sympathies; originally an almost poetic soul, or man of genius, as we term it;"
Italian opera composer Giovanni Pacini, from his Memoires: "The celebrated Coletti in the role I entrusted him was not able to be surpassed by any other artist. Even Paris, when my fortunate work was presented at the Theatre Italienne, proclaimed Coletti 'The Greatest', 'unreachable'."
From the nineteenth-century British music journal Musical World: "The faults we have to lay to his charge – for which of us is without them? – are a want of colour in his expression, a monotony in the form of his cadences, and a method of reaching the high notes, which belongs to a bad school of singing."
Lexicographer Francesco Regli writes: "One observes with great astonishment the ease with which he executed the most difficult of roles, dramatic as well as those of agility, the extraordinary extension of his voice and the colour that is so indispensable in the various characters in the music."
Portraits of the three baritone rivals, by Josef Kriehuber, the viennese artist.
Filippo Coletti