Unfortunately we are plagued by a frustrating lack of full compatibility between the various Pentax and third party budget P-TTL models ....If only they all "worked together" fully then life would be much easier (and cheaper).
The Yongnuo 585EX has the P-TTL Wireless functioning, as a slave, but not HSS .... so it can be used as a P-TTL slave controlled by a suitable "Master / Controller" flash (eg AF-540FGZ/II), but we can't buy two of them and get this wireless functioning.
In the case of the Shanny, it gives on-camera HSS, but no P-TTL Wireless. So people are left digging around wondering about triggers. IF you have to use two V6II units, that defeats the purpose of saving money buying the flash!
What we need is a "Shangnuo" model, that's has it all, and still for under $100