Wadia 581iSE vs Esoteric X03SE

What DACs are found in the Wadia 581 (and 781 for that matter) and has anyone compared the Wadia to the Esoteric?

Thank you all for your respones.
I have compared both and the Wadia was better for me. I compared the Esoteric X-01 to the Wadia 581ise. I had them both at the sametime.
I have listened to them both in the same components system at the same time. Wadia gave a tight soundstage and better bass (more controlling).

However, with the total money invested for these two, Esoteric sounds a little more efficiently than Wadia.