This whole thing is silly. It is like trying to determine what the worlds best beer is by measuring the dissolved solids in the water, the purity of the hops and other ingredients based on some regional point of origin baseline. In the end, it will always return to subjective preference no doubt at all. I just loaned my Z1R to a very experienced head-fier who owns a nice stable of very well respected headphones and has owned many other very good headphones in the past. He has now decided to buy a Z1R himself. Go explain that? I can, subjective preferences, no measurements or Internet experts required, just a source, an amp and your ears.