Bad news and good news. After updating my version of DAZ Studio, I came to the realization that 3Delight is no longer supported, which is what LittleDragon/CharleyFox's Krystal model was optimized for, and what I've been using to for all my Krystal renders. While it works fine in Iray, it requires a lot of re-optimization to look decent.

The good news is that I had already been in the process of fully re-optimizing the model's materials for use with the Iray engine! The result (I feel) is absolutely gorgeous level of borderline photorealism!

And just for fun, I made this absolutely massive 2K "sample" render. lol