Listening to three sessions out of this box set last night:
Very interesting to hear the different recording studios in action.
Sun Studios provided a close but wide and full instrument sound with thinner, vintage sounding vocals. Drums were sounding right there!
Nashville Session gave an excellent full, warm vocal with a slightly more compressed and recessed soundstage. Still lovely!
Ram session provided much darker yet incredible non compressed, open sound.
Great comparison of the same songwriter in three different sessions!
Edit: Watch the documentary from the set here:
http://vimeo.com/30702742