Ran the stereo SACD track against the stereo track on the Blu-ray. At first blush, they seemed pretty close. Closer listening had a lot of subtleties coming out on the SACD: Tighter bass response, and better definition overall.
One example is Nick's cymbal work during "Have A Cigar." On the Blu-ray, you can tell what kind of cymbals are being played. On the SACD, the cymbals actually sound like they are supposed to: the decay on the ride cymbal is quite noticeable. Nick's drum work is typically on the soft side. For the first time, I'm hearing all of the subtlety that comes with it. Wonderful stuff.
Overall, the SACD track had the same kind of dryness to it I found with the RB track, and again, it's not a problem. In a lot of ways, the SACD feels like a Steve Hoffman job. This disc is a must have for all Floydians.