Hughie, I have not heard the ARCAM but I do own the Esoteric P3D5 combo. By far, the Esoteric to me is the most detailed and dynamic cdp I have ever owned. I am constantly amazed at the level of low level detail and nuance the Esoteric is able to extract from the cd. My good friend has the Ayre cdp and while the Ayre and Esoteric do sound remarkably similar, I preferred the Esoteric because of its bass and build quality.
Good luck!
Good luck!