Right now I have 2 iems: Phonak PFE & Fischer DBA 02. do you have input for upgrade? i love more pfe compare to dba 02 due to forward and smooth vocal. dba02 is laid back except i plug the right into left and the left itu right.
That's a tough one. My first thought was the Westone UM3X, which is really smooth and forward in the midrange and still extremely detailed, much like the PFE, but if you like the aggressive presentation of the PFE you may find the UM3X slightly boring, much like I do. The Ortofon e-Q7 fits the bill too if you can live with a bit less treble extension than the UM3X/PFE are capable of providing. Everything else I can think of with that signature wouldn't really be a clear step up over the PFE in overall SQ (though I haven't tried the SE535 or SM3.. yet).