Any company can have flukes, but Civivi/WE is one of a few manufacturers that just don't need to be questioned anymore. Their 9cr18 is an excellent rendition of an underrated and all around decent steel, their 14C28N should be similarly excellent (for the price, like always).
I can't speak to how Kubey and Petrified Fish do at their heat treat, and I don't even know if they're actually manufacturers or just lines of knives made by another OEM. I think Kubey is a manufacturer, but I don't know for sure. If they're not, I don't know who is making their product.
But i wouldn't worry about the heat treat of D2 from either of them, since they're going the route of trying to establish themselves as legit companies. D2 is a known quantity and only a total scam operation is going to turn out garbage D2. It's too cheap and there's too much data on how to work with it for any half-serious business to try ripping us off on it.
That said, if I were you I'd probably just pick one of the many gorgeous Civivi or Kizer budget knives of the last couple of years and call it a day. I love knives but I hate getting disappointed and I like what I know. Kizer and WE are my two standby manufacturers, they release designs I would buy more often than I earn enough to buy them.