I can listen to headphones that stray from my preferred signature, but not for too long - my brain keeps telling me - "Why are you doing this to yourself? You are missing so much!".
Question is - what do you prefer? If you prefer HD700 and ATH-AD900X over H6 and HD600, Pro 82 may be your new favorite headphone.
If you prefer H6 and HD600 over HD700 and ATH-AD900X, even if you end up liking Pro 82, they won't amaze you.
Tuning foams may help you adjust Pro 82 to your liking, I advise to purchase them immediately.
I think Pro 82 will sound great with LG V20, maybe with FIIO E6 as an amp.
The thing is, I don't really have a preferred sound signature, but rather I can enjoy different sound signatures.
I don't really prefer my AD900X over my HD600 or vice versa so much as I enjoy them both.
I suppose I should say I do prefer my HD 700 over my HD 600 and AD900X, not because I prefer one sound signature but because to my ears the HD 700 is superior technically to both. However, sometimes, when I want something warmer, it is true that I will pick up my HD 650 -- so in that instance, I would say I prefer the HD 650 to the HD 700 even though I find the HD 700 to be technically better.
I definitely prefer all of those over my H6 unless I need the isolation or portability of the H6, since my preference, sound wise, is always open over closed.
I find it really just depends on my mood and how my ears are feeling in that moment and the particular music I'm listening to.