The A2 performs great. Mojo, you need to keep in mind the Z2 came out many years ago when HDCP was a new technology. Which unit is at fault, not sure. The Z2 works with other players like my Panny S97S which is HDMI as well. The Z3 works fine with the A2, so I'm thinking the problem lies with the Z2 not being truly HDCP compliant.
Anyway, I will most likely take my A2 back, unless I think of some other option.