To be fair, the footage in "This Is It" wasn't even meant to be seen by anyone other than MJ himself, so the fact that we have it AT ALL is a miracle, let alone whatever quality it's in.
Also, for everyone who doesn't already know, this is from Criterion Collection, who are the best of the best in terms of film restoration and physical movie releases in general. They usually specialize in classic and historically significant films and very rarely have "big" studio films in their collection (there are some exceptions, like Thelma & Louise, Wall-E, a few Spike Lee movies, etc.). These guys even released a big ass box set of all of the original Showa-era Godzilla films, and for Godzilla fans like me, it was AMAZING.
TL;DR This will be the DEFINITIVE version of The Wiz.
Not to mention, Criterion does 50% off sales at least once a year through Barnes & Noble. If you guys don't want to immediately get this blu-ray, just wait until the next sale rolls around and you can save a few bucks. That's what I'm gonna do!