I have heard master tapes on acetate from the 1950s that sound far superior than any LP of the recording, including the original shaded dogs. I have made copies of my session masters for various purposes, and in all cases, I doubt anyone could tell the difference between the original and the copy. The act of mastering a recording and cutting a lacquer lose so much that the difference between using the "original" master (whatever that means, but let's just say an edited work part) and a properly made copy of the same is comparatively insignificant. I seriously doubt anyone can make the claim that doing a 4xDSD "master" will result in a better sounding vinyl than making a 1/2" analog master for the cutting. But of course, the DSD "master" is much cheaper and does not require any space for storage. I have just started to systematically go through all the versions of vinyl of titles that I also have master tape copies of. The idea is to get rid of the inferior sounding ones to make space, but I might end up getting rid of all the LPs ! I have just gone through the Decca Solti/CSO Beethoven 9th (1972), including the narrow band box set, the 1981 MFSL reissue and the Speakers Corner reissue, all bought new at various times. The MFSL sounds the best amongst the LPs, but this is not saying much, as it still falls far short of the tape.