Simple fact of the matter is that when the black levels get that dark it's hard to reliably measure.
For the most part I think that when the measurements get in those ranges it sort of becomes more of a pissing contest as to who has the lowest black levels-- at that point it's dark enough and you can start focusing your attention on which panel performs better in other areas of PQ.
Personally I would have been happy with my 2008 level blacks if they had only stayed that dark... In fact I think that if you're a real hound for inky blacks then you're better off shopping the led LCD competition. Even if they get there by 'cheating', many led sets produce a stunning contrast. I still prefer the look of plasma.
What to do if you find yourself stuck with no hope of rescue:
Consider yourself lucky that life has been good to you so far. Alternatively, if life hasn't been good to you so far, which given your present circumstances seems to be more likely, consider yourself lucky that it won't be troubling you much longer...
-- Excerpt from the Hitchhiker's Guide to the Galaxy.