Karl Markovich (continued...)
There were two more masterpiece figs made for Ultimates. They were the Hulk and Magneto uniques. They came packaged as LEs (with boxes) and the CoA's were in the boxes. Again, there were 50 of each made and they were given away as 1st place and fellowship prizes at some regional tournament or other.
 
There were two masterpiece figures made for Mutant Mayhem (besides the booster Spideys). They were the MODOK and Loki uniques. They were also packaged as LEs, 50 of each made, and given away as 1st and fellowship at some regional event or other.
 
Finally, there are a few "one of a kind" masterpieces floating around that were given to winners of Worlds-type events. The winner picked their fig and WK hand painted it as a masterpiece for them. I remember Stilt-Man (in gold armor) and Doc Mid-Nite (in the original Charles McNider costume) being done... and maybe a Black Bolt, but my memory is fuzzy on that one.
 
While technically masterpieces, the one-of-a-kind figs were never available in any way to the general public so they usually aren't considered when talking about masterpiece figs. Most people consider the six that were (somewhat) obtainable.  
 
At one point I had them all, but sold them a couple of years ago when I started to work to pare down my collection.
 
Hope that helps.

Related: See our exclusive interviews with Seth Johnson, Jason Mical, and Karl "Hair10" Markovich