Coming rather late to this, but I downloaded these files over a year ago and just got around to listening to them carefully this morning. I'm in the market for a new cartridge and thought it would be fun to give the comparison a go.
I find the original feedback fascinating and in line with the axiom that each person hears things differently than another. When you think about it, it makes any comparisons, even ideal ones in the same room with the same equipment, rather meaningless--much like how each person sees color differently than another person. Yet, we all continue to do this since we are social animals and like to learn of other's opinions and insights--even if in the end they have no bearing on our personal reality. It's a hard habit to break, and is, I think, something central to our hobby and unlikely to ever change. I think all of us actively ignore that though there may be a few things about the sound of a particular system (or cartridge) we all can agree on, when it comes to nuances presented in tests like these, there can never be universal agreement.
After that long caveat, here's what I heard:
1) The Air Tight PC-1 suppresses surface noise on the test track much better than the Benz LP s (but at a price, in my opinion).
2) I play the piano every day, and compose music. As such, I have a set of biases about how a piano's sound board and strings "ought" to sound (which is why, of course, there are so many brands of pianos!), and in this comparison, the Benz LP S present to my ears a much more accurate, musical sound of a piano. The Air Tight is cool and mechanical to my ears in this regard.
That people prefer the PC-1's presentation and describe it as having "more resolution" is unsurprising then--many ears and brains find this "better" or more pleasing. For me, however, there is no contest between the two in this limited test--if it were two pianos being played by the same artist in the same room instead of two cartridges, I would buy the piano that is being represented by the Benz LP S' sound in a heartbeat.
Deciding if this sort of impression is useful or not is also probably meaningless. :-)
Kip