I watched all of them and came to the conclusion that it all depends on the program material. Some just doesn't benefit that much from the higher resolution.
I also did a comparison for DVDBeaver on the Terminator 2 Extreme DVD http://www.dvdbeaver.com/film/dvdcompare/term2.htm .
It compares three versions of the film:
(A) the remastered, HD version on the Extreme DVD
(B) the remastered, non-HD version on the Extreme DVD
(C) the non-remastered, non-HD version on the old Ultimate DVD.
And I noticed a much greater visual improvement going from (C) to (B) than going from (B) to (A). So it seems a good remastering of the source material, like what was done here and for Criterion's Beauty and the Beast and M, gives you worthwhile and often drastic improvement. But a HD transfer, even when done perfectly, may not always give you as drastic an improvement.