Wow, now that's a description!
Do you think there is a huge leap in detail going from the 4 Ai to the Tzar 350? I'm sure there are others with both IEMs. Based on what I'm reading it is analogous to RE-Zero and RE-262 combination.
The real solution is own both
I wanted to offer two high impedance products, one for extreme detail lovers, & I'm talking about the type of drivers that tranduce the thoughts of a flea, coupled with a black background.... that sums up the Tzar 350. It was inspired due to the AK100 (you can read that thread if you want)