You can win against a khan for his high sustain plus damage. If spotted get behind and create a crossfire to make him show his back to your team or to die from your poke.
Vora does not counter Zhin for he has high damage plus sustain. He can time your obliterate w/billow&dash to counter it or cleanse bleed w/billow. To fight him: build stacks then fight. If not max stacks keep outside his basics