Beside some Spanish guitars I own 4 Asturias guitars, all in almost mint condition:
-a "Standard" model with spruce top
-a "Standard" model with cedar top
-a "Tsuji S-1" model with cedar top
-a "John Mills 20 S" model with spruce top
I think Asturias guitars are good, very good guitars, but not top of the range. If you are looking for a concert guitar and your budget is beyond $3000 then you might look for other world class luthiers. But below $3000 I think Asturias can be great choice as you get a lot of value for small money.
The quality of all Asturias models I have seen was very good. If you look in the inside of a guitar you see that every part fits perfectly together, with no gaps, and you won't find any ugly pieces or traces of glue. This is different to many Spanish guitars where you can find traces of glue even in expensive models.
Every guitar has a different sound, so I think there is no typical Asturias sound, and even no typical Japanese sound, compared to Spanish guitars. The models with cedar top are louder than the models with spruce top, what is typical for cedar/spruce wood.
If you read guitar books written by luthiers, then you can learn that loudness is not the only criteria for the quality of a guitar. Sustain is another very important critaria, and loud guitars often misses sustain and vice versa. People often try to buy a loud guitar and disregard the sustain, like buyers of digital cameras that only look for a high number of pixels.
Some time ago I brought my John Mills guitar to a luthier to renew its finish. Now it's completely covered with Shellac and it must be the best preserved JM in the world I guess. The loudness of this guitar is only medium but the sound and the sustain is really great. But at the end it depends on someones preferences and the music that should be played on the instrument.
I hope my information helps somehow
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