I have often read that Mosfets are often the choice of transistor amp designers who mean to emulate certain tube virtues.... Hmm.
One can also read that fuzziness, softened transients, smoothness/warmth and a small degree of thickening are also hallmarks of Mosfet Mist.
While I have owned Mosfet amps for which the above is certainly true - it would not be right to characterize all Mosfet amps that way.