Ah, I see what you mean Michael,
I have not heard the 2005 masterings of the DG set, but I have heard a few of those new Japanese SHM-CD masterings of the DG cycle, in particular, the M3, M6 and M9, and they show a significant improvement, quite dramatic to my ears...but it is very expensive to aquire...around $300 or so from HMV Japan the last I checked!
Anyways, the sound may still be a little bright on this new mastering, but there is more room to breathe in the soundstage, quite beautiful, and I hear the M6, for example, in a new way. There is definitely more details (I'm listening to the M6 now).
John has also heard some of these recordings from the Japan SHM set and hopefully he will chime in.
--Todd