The Vienna tweeter wasn't the last word in terms of details. It was sweet and precise but when we switched for the PSBs so many details came up.
The transient of the PSB is so much faster than the Vienna. Very dynamic.
I actually bought the One over the Two for there better definition in the midrange. The dedicated midrange driver makes a huge difference. Female voices were much much better with the One.
As Mlauner said :"One blows Two away".