Ok i've got 2 Yaqi brushes the one below which is a 30mm black fiber and a 30mm tuxedo. And I have to say the Yaqi black fiber is miles softer than their tuxedo. Wow the brush as beautiful. Its a sweet spot between an APshave's tuxedo and cashmere. Its not like the boss knot which I thought it would feel like due to the looks.
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The black fibre is my favourite knot/brush, mine is the 26mm red handle (not the balluster, the other one).
My impression was that the fibres were the same as the Tuxedo, but the glue bump was lower, hence less backbone (more to my taste). As a consequence I sold all my Tuxedo brushes.