The rosewood used in Urushi is aged and harder (dryer). Could be the same as Pro IV (Rosewood Platinum). Also, Urushi has tighter spec'd coils and magnets.
If it is just the body, can't fully explain the improvements in refinement, extension, and soundstage. Of course, more dynamics, more sure footed which could be attributed to more rigid body.
I have not heard the Rosewood Platinum myself, but someone who had opportunity to hear still prefers the painted body, so the paint must be doing something as well.
BTW, look up Urushi in Google. They are extremely hard and will get harder as the paint ages. I am sure I don't own Koetsu for utility value, but love the painted surface too. The gold dust finish makes me spin....
If it is just the body, can't fully explain the improvements in refinement, extension, and soundstage. Of course, more dynamics, more sure footed which could be attributed to more rigid body.
I have not heard the Rosewood Platinum myself, but someone who had opportunity to hear still prefers the painted body, so the paint must be doing something as well.
BTW, look up Urushi in Google. They are extremely hard and will get harder as the paint ages. I am sure I don't own Koetsu for utility value, but love the painted surface too. The gold dust finish makes me spin....