Diehard Sony Fan, always wanted to get both of the Z1Rs, finally pulled the trigger last week(along with the FIIO K7). The FIIO K3 will be paired with the IER-Z1R. The FIIO K7 will be paired with the MDR-Z1R. Wanted to get the TA-ZH1ES, but currently out of budget.
My 1AM2 and N3AP can finally retire.
I think it's a well balanced, spacious sound with a lovely bass shelf. Still detailed. "Elevated U shape," if you like.