I haven't listened to this for a long time, I havei t on vinyl somewhere, but wow, what an amazing collection of tracks. You've just inspired me to dig it out of my collection the first chance I get.
It is really hard to judge what the mastering has added to any recording without hearing the mixes, a large part of mastering is also knowing when to do very little.
For me a Great recording is made at every stage of the process, but more importantly a great song. The tracks on that record really never made me notice the production, just how great the song is.