I spoke to Jonathan (last?) when his table was still in development. He spoke of using a cutting lathe as a model and I know Mr. Krebs had considerable influence.
How can you meaningfully compare these, and with what variables? I suspect at some point, there are ergonomic considerations. I've followed a fairly masochistic route that brought considerable performance gains by increments, but none of this is plug and play, especially at this level. Arms, phono cartridge choices, phono stages and the overall "voicing" of the system all play a role in this. I'm not sure how you eliminate such variables, let alone get to make meaningful comparisons.
It's a process as much as a destination. I think you learn a lot by listening, but chances are, those will be in systems/rooms that are not "known" to you. How to sensibly approach this?