I agree that it's not all subjective. I would even go further and say that there is a foundation of objective principles at the root of everything in this hobby-- this is why if two people are being sincere then any discrepancy in the way something is heard can, through discussion, be traced back to things like hearing sensitivities, music library, and so on. However despite the fact that there are clearly objective principles at play this hobby is by and large driven by subjectivity-- which is to say individual responses to objective principles. While any two people can objectively listen to the same thing, no two people will necessarily hear it the same and thus this hobby goes. These "ranking lists" for me are simply favorites lists-- what I happen to be enjoying at a given moment. That said here is my current top 10, that is to say the 10 IEMs I am currently enjoying-- or most fondly remember enjoying-- the most. After about the top 5 it's fairly arbitrary.
1) Annihilator
2) Trifecta
3) Gaea
4) Supermoon
5) EXT
6) Kr5
7) Traillii
8) Mentor
9) Zen Pro
10) IER Z1R