My copy of the Japanese SACD arrived today.  Owning two Oppo BDP-93s, I hooked both up to the same receiver and compared both editions.  Confirming another review, the SACD is indeed presented a bit louder than the DVD-Audio.  However after over an hour of listening, I can hear no discernable difference between the audio portions of these discs.  Yes, both come from the exact same 5.1 master.  In fact, even the disc labels on both are practically identical, one indicating SACD emblems and the other DVD-Audio.  So no new sonic revelations over the 2001 DVD-Audio release.  One advantage for the SACD is that it will play in all CD players as it is a hybrid.  One advantage to the DVD-Audio is the on-screen presentation of the lyrics and many photos.  The best news is that, even at Amazon's current price, the SACD is a steal compared to the prices being asked for the out of print DVD-Audio.  My biggest hope is that these discs from Japan will bring about renewed interest in 5.1 sound music, so that we may be fortunate enough to see other timeless classic recordings released (not just rehashes of previous DVD-Audio releases) in multi-channel SACD....please, please, please!