I was able to pick up the base set of 6 sumo cards fairly inexpensively. Each of the cards has the wrestlers squatting just before the match begins with the Masterpiece tag above his name in both English and Japanese. The back highlights his career statistics and a small paragraph under his picture with more anecdotal info.
The second subset is the Stay Gold Subset although I have yet to see any of the actual cards come up for auction and have only see photos of these cards in SCM. Right now they are issuing exchange cards, see above(image above from Yahoo Auctions), for the actual card in the near future. There are also three sumo cards in this set: Chiyonofuji, Takanohana, and Hokutoumi.
Yokozuna Hakuho is the only sumo wrestler in the Superstar subset, but there are different parallel cards of him for this subset. A base card, a gold parallel numbered to 200, a hologram parallel numbered to 100 and a hologram PP parallel numbered to 100. I am not sure what the difference is between the two holograms, but one of them is shown above.
Here is the complete sumo checklist for the 2016 Masterpiece Set.
Musashimaru-Horizontal (#ed to 90)
Musashimaru-Vertical (#ed to 60)
Takanohana-Horizontal (#ed to 90)
Takanohana -Vertical (#ed to 30)
Akebono-Horizontal (#ed to 89)
Akebono-Vertical (#ed to 60)
Hokutoumi-Horizontal (#ed to 82)
Hokutoumi-Vertical (#ed to 60)
#SS12 - Hakuho
Gold Parallel (#ed to 200)
Hologram Parallel (#ed to 100)
Hologram PP Parallel (#ed to 100)
#3D06 - Akebono (#ed to 50)
#3D07 - Musashiyama (#ed to 50)
#3D08 - Hakuho (#ed to 50)
#SG05 - Chiyonofuji (#ed to 50)
#SG06 - Hokutoumi (#ed to 50)
#SG07 - Takanohana (#ed to 50)