I finally got to listen to the M9th from the Carnegie Hall set.
I think this recording is indeed originated from the DSD mastering that was used for the Japanese release. Doing A/B comparison with the Japanese SACD (I heard only the regular CD layer), however, revealed that there is some difference in the sound quality. Although the basic sonic spectrum sounds the same it was the Japanese pressing that sounded superior, juicier and sweeter with slightly better dynamic range and clarity. This could be due to the superior pressing technique that the Japanese had used. I am sure the SACD layer will sound even more impressive. The Carnegie Hall version, on the other hand, is rather restricted and less clear in details, especially in the high end.
So, of the two versions, although they both seem to have originated from the same source, I would still go for the SACD one.
Here is om overall ranking of all the different versions of Lenny's first Mahler cycle:
Japanese SACD > Carnegie Hall > CBS> Sony Century > Sony Royal Ed.
But this judgement is only based on the M9th.
John,