Yeah I seriously doubt it.
FWIW, I never thought the K812s were ever "studio grade". Can I ask you what you consider a studio grade headphone/IEM to be? Just curious where you're coming from? Plus, the vast majority of folks who buy headphones/IEMs in this price range are most likely audiophiles and couldn't care less about the "studio" moniker.
Check out Jude's comments on them too. His favourite IEMs (even over his customs).
They were advertised like that, like the Layla is as being mastering grade. I didn't encountered yet a headphone that can be called that (although the HD800, with a touch of eq can be very good), but, being one of those who are waiting for such a thing to appear I was interested in both these models. Fortunately the measurements for the 812 appeared pretty quickly, but for the Layla they didn't, so I had to buy blindly, also because, I have to admit, I'm more attracted to IEMs than to full sized HPs. It wasn't the smartest move, but I had (too) high hopes, thinking, if those guys are in their right mind, they know it would be stupid to advertise a listening tool to be that if it's not.
And yes, I read everything there is on this site about them and most of my comments in our discussions are related only to what I found to be different from what I read. Maybe you misunderstood my position, because I insisted to point out the things that are not in line with my findings, but besides that, I have to admit that (unfortunately), Layla is still the best IEM I've heard to date.
Regarding your question; I'm coming from professional monitoring systems, not headphones in particular, although I'm very much into them because they have a huge potential. And my position is related to that, since there are no 'mastering' headphones, only mastering speakers, at least at this point. From this point of view Layla is a joke. A bad and an expensive one. Anyway, I did eq-ed them, as I do with all my headphones, and they sound stunning at this point, but unfortunately that's due to a lot of time I had to invest into that, and not because the (arrogant IMO) claims of JHA. Oh, and the build quality is also so-so. Maybe, and now I'm beginning to think that was the true goal behind their marketing strategy, these are not aimed at professionals, but exactly, as you pointed out, at audiophiles who will think they are buying mastering grade stuff.
Besides that, I surely don't need to read anything to understand what I'm hearing. I'm pretty good at that and, if that matters, I'm the only audio engineer from my country with productions nominated to the Grammies and with two other productions that made their way up into the American Billboard (one of them even reached no1 on its section). So maybe I have an idea what I'm talking about and, as a customer, I feel entitled to question the quality of what was sold to me.
Cheers.