I haven’t yet received the Halcyon (it is waiting at the Post Office for me), nor the PB1or EDP which are still en route, so my comparison is incomplete. Of the Zenith, Aten, Red, and Rah, I prefer the Red and Rah.
When I have collected the three incoming I will probably sell the Zenith and Aten (no listening time), the Rah (since I will have the PB1), and possibly the Halcyon (I will have to see how it compares to the others I will keep). But just speculation until I test things out. I have accumulated way too many IEMs and it is time to thin out the collection.