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The low DR tracks at the end are that way by design, as they are test signals. The highest DR tracks (DR20) are considerably more dynamic than most loudness-free tracks I've tested (mosly classical).
Stereophile, several years back ("What's Going on Up There?", Oct. 2000), reported that certain high-rez releases (DVD-A and 24/96 DVDs, I think) were not spectrally extended, as high-rez allows.
Not sure about freq. spectrum, but the DRD reports several titles where HDTracks releases are dynamically "compressed" compared to other mostly older releases, or LP rips, of the same album, of course.
The DR Meter tool, noted above, is quick/easy to use ... and including DR in the product description by HD Tracks or other downloads-seller, helps keep the mastering engineers "in check".
Just found it after the fact ... this thread's topic has already been mentioned by Stereophile, back in May 2012...
http://www.stereophile.com/content/unofficial-dynamic-range-database
... seems to be a decent write-up on this topic. And the below-blog comments are extensive and intelligent.