This is a variety carried by Cliff England, I have a grafted one still in a container but I wasn't sure if it's worth growing. Here's Cliff's description of it:
"Hokkaido - Diospyros kaki Persimmon.Cold hardy in zone 6; has never had freeze damage here in Eastern Kentucky. Hokkaido is a natural dwarf--at 8 years old this tree is only 6 feet tall and 5 feet wide. It is a natural fruit producing male to use as a pollinator for other trees also. Fruit shape is conical (shaped like and acorn). Bright orange with a blush of red, smooth flesh and very slow to lose astringency. Needs 2 to 3 weeks stored on a shelf after picking.Fruit size 3.5 inches across by 4 inches long. Cold Hardy Zone 6"
Lucky did your tree produce yet? how to you compare the fruit to the other oriental persimmon?

Hokkaido is a small tree and could be good as a dwarfing stock.

Here's an update on the tree. I planted the Hokkaido in the ground here in zone 6. It had survived the winter fine, it's growing vigorously. No fruit yet can't comment on whether it's dwarf or not yet.

I planted a Hokkaido from Mr. England this spring and it grew more vigorously in its first season than any other first-season persimmon I have ever planted (Szukis, Morris Burton, Miss Kim, Sheng, Smith’s Best (Giboshi), and Great Wall). I emailed and informed Mr. England of its vigor, and he gave me a nice reply that said his Hokkaidos that are on their own roots are dwarfed, and that Hokkaido may grow more vigorously on other rootstock. That is consistent with my Sheng from Edible Landscaping: it is also supposed to be at least semi-dwarf and yet I have had to prune the tree back quite heavily the last two years.

So if you want dwarfing rootstock from Hokkaido, you may have to get it on its own roots; for example, air layering.

Al