Quality Control of blu-ray releases Megathread

[Q?]

This thread is intended for movies with different released version's
i.e.
Hellboy II: The Golden Army
U.S. version got a MPEQ-4 AVC encode (region free)
https://www.blu-ray.com/movies/movie...38&show=review
And the UK version got a VC-1 encode (region B)
https://www.blu-ray.com/movies/movies.php?id=1945

In the U.S. Review, it's claimed that the PQ is refence quality.
And I got the UK version which is NOT a refence PQ!
Though the UK PQ is not poor I suspect the U.S. release to be more worth the money!
And Planet Earth for example, some of the version's are 1080i (interlaced)
and 1080p (progressive). My copy from 2 Entertain with Sir David Attenborough narrating is 1080p fortunately.
It can be confusing which copy to order as you can't be absolutely sure
if this is the best version.
Let's help each other with finding the best version of blu-ray releases!