The IE80 is a repackaged IE8, anyone selling these things as anything more than that is selling crazy.
The reps aren't ill informed about this, and the two sound the same side by side by my ears.
The reason Sennheiser is not mentioning any changes in the performance of this new issue of the IE8 is because there aren't any.
If you believe otherwise, you are choosing to believe that a well established and successful company like Sennheiser is just throwing out
products and just forgetting to tell everyone they improved or changed the sound. Those silly absent minded marketing folks at Sennheiser,
and their ill informed sales reps, tsk tsk. These people didn't get to where they are by running a dysfunctional operation.
They didn't simply forget to mention that they re tuned the sound, because they didn't change the sound. For those that claim to hear a sound improvement,
it is all in your head. If you currently own an IE8, and could care less about the cosmetic change, do not buy the new IE80, because it is the same IEM.
This thread is proof positive, in the business of audio, people will hear things the way they want to hear them. If you believe they changed the sound of something,
well then by golly, they changed it, regardless of the reality of the situation. The mirage is real if you believe it, or not.