Rossyanka can handle the cold to -20F without no Winter damage. JT-02, I Winter protected it the first year and now on it 3rd leaf and can handle -12F for several nights the last few years. I got my scions from England.
I got a 7 years old Nikita's Gift Hybrid. I have baby this one for all those years with Winter protection. The fruit is excellent but not very cold hardy for a Hybrid. Lots of died back at -10F. I liked Rossyanka a lot. Very productive and very cold hardy to -20 F. I Winter protected it the first year to get the bark harden.
JT-02 has very rich and sweet taste per Cliff and SMC.
I got 2 Kassandra but one of them died at -9F last Winter without protection and the other survived with protection. I will baby it for a couple more years to get it bigger and I will test it without any Winter protection. So it is not as cold hardy as Rossyanka and JT-02.
Chinebuli died at -9F.
I will topwork most my American persimmon understocks to JT-02 because of the excellent taste, cold hardy to my Zone 5 and the leaves are large just like a Kaki.