I can't offer comparisons you ask for but I have spent the past three months with my Wadia 121 and it just keeps getting better sounding as it continues to break in. I think it has about 200 hours on it now so I believe it is fully broken in. It is a very musical and smooth sounding DAC with great resolution without fatigue. I am always curious about other DACs but for now I'll stick with this one. It is very affordable and feature rich.
Peter
Peter