For those who wish to know how this release compares with the MoFi version - it is superior. There is better imaging, transparancy and it sounds tonally superior. All in all, it just sounds more natural. This is not only my opinion but the opinion of the owners of ProMusica here in Chicago as we did an A/B comparision on PM's reference system.
That said, the differences between the two versions are not profound. So whether you will hear the differences, if you already own the MoFi version, will depend on the quality of your system.
To answer the source question, as indicated for the MoFi release, the original source is PCM digital files. Also, it appears as if this was initially intended to be a Run Out Groove release based on what is written in the run out groove.