The WonderEdge is harder steel, that was part of the mystic, they have a special frozen blade...
I didn't notice to much of a difference on the upper grits but on the lower grit it did take a little more time to establish the bevel...
Also I noticed that like most "Frozen Temper" blades the WE loves pasted strops... IMHO
I think that in general the harder the steel on a blade the better it does on a diamond pasted strop.