From everything you read about the Peacock, it is definitely different from the Arya.
In the end, it depends on how you personally like the headphones, because everyone feels differently.
I had the Meze Empyrean and sold it again after 6 months - for me it was not the "great" pair of Cans it is traded as here.
I also had the Arya, and I sold it again, simply because it was too strenuous for me and was far too dependent on the quality of the recording.
Just like its big brothers, the HE1000Vs and SE.
The only Cans who has really and truly convinced me so far is the HEDD.
A completely different way of enjoying your music, and that's exactly what I hope for from the Peacock.
Mine should arrive today, I'm very excited.