Hi Roger,
If you are on Google+ there is a landscape astrophotographers circle
https://plus.google.com/117178975214...ts/G9s5GrQPCZs (that I am humbled to be included in) that I know has a few people who are shooting with the new Mk III and posting their images there. Randy Halverson
https://plus.google.com/115274420552571826637/posts is one that I can think of off the top of my head who has posted a lot of recent Mk III images.
Cheers
Greg