I think it is a great question. I think folks that are very experience with different cartridges and systems can generalize about the sound of cartridges. Folks with little experience would not be very good judges.
I for instance use a Koetsu Rosewood Signature. I would not consider it a neutral sounding cartridge, it is very warm and musical. I own it, and love it, but would not offer as a contender.
I think if we had lots of folks with extensive experience offer their opinions we would get a convergence around a couple different lines.