I agree with shawarma_bees’s description.
Visually, Fazioli’s are among the most gorgeously produced pianos - as their standard! Even the smaller ones are done absolutely beautifully. The finish, the cabinet, the gorgeous woods used inside the body of the instrument, just everything. Beautiful visual aesthetic seems to be one of the defining ideals of Fazioli.
And the tone, wooden and warm and rich and noble, is STUNNING!!!…but, also, decidedly limited in palette and timbre.
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I consider Fazioli’s to be Bosendorfer's warmer and less savoir-vivre cousin, in that they have similar overall characteristics. Much like Bosendorfer, they don’t change much from PP to FF. If you’re a person who likes those wide tonal/timbral changes, that whisper quiet pianissimo all the way to that chaotic fortissimo, you will not be pleased. The Fazioli tone stays the same across the dynamic range, with only a slight addition of harmonics as you approach the fortissimo. You have to push to fortississimo to truly get the harmonics you’d get with other instruments, and which the general de-facto-piano-sound-tuned ear may desire.
Likewise, the notes stay pronounced, individualized, and clear all the way to the pianissimo, so if you like that wall-of-sound effect that can be created with a Steinway or similar instrument - that technique that many great pianists make use of for certain eras of music wherein everything but the melody/melodies is reduced to a whisper of colors and the voices stand out above it all in a bel canto fashion - you will not be pleased.
Where they differ from their older and more bourgeois cousin Herr Bösendorfer is that they lack a definitive bass. Whereas Bosendorfer takes bass to it’s most colorful and rich extremes, Fazioli’s don’t come close to it - they don’t even attempt to match Steinway or Yamaha - they have among the most laid-back bass you’ll find. And this is in large part because they avoid fractious harmonics/overtones, and lean into the fundamental across their range, and especially in the bass. The end result is a bass that sounds rather…colorless. Strong fundamental - unlike some other pianos, the fundamental remains clear no matter how low you go - but strongly lacking those harmonics that the ear often associated with bass, and those colors that thrill and excite us with a Steinway or Bosendorfer.
However, where it excels…it absolutely excels. Like Bosendorfer, there are certain eras/genres where a Fazioli sounds better than anything else. But, I do not consider them to be as versatile as a Steinway or Yamaha, and in other eras/genres, they are not a good fit.
But if a Fazioli fits your playing style or lends itself to the era/genre of music you primarily play, you probably wouldn’t want anything else. Like a Bosendorfer, if it fits you, it fits you like a globe, and everything else may sound to safe/general/typical/sterile in comparison.