What's the difference between the CXA81 and CXA81 Mark II?

The inspiration for the CXA81 Mk II came from the possibilities offered by the ESS ES9018K2M SABRE32 DAC.

This new and upgraded DAC is the main difference between the CXA81 and Mk II, as well as ten new op amps, and a lot of listening and re-tuning.