I absolutely loved this album.
One of the brightest pop gems of the 70's.
This was a rare case: a major album that I came to know in quad first.
I had heard the two hits on FM, but my first experience really listening on a decent system was quad. Unfortunately, I think this initially caused me to give the quad mix more credit than it deserved.
Only a decade later in the CD era did I hear the stereo mix. On two tracks in particular -- Sunrise and On Broadway -- the differences are substantial. As usual, I think the stereo mixes are better -- but not by a wide margin. This may illustrate nothing more than the tendency to be faithful to the first version one hears.
Back to the quad -- it's Arista, and that means conservative. One reason: (too) late in the CD-4 game, labels discovered that less aggressive front-to-back separation resulted in less distortion. There's enough discreteness to satisfy on most tracks, but today I find the long instrumental break on All By Myself sounds almost like double stereo.
The real test: How does it compare to the CD through DolbyIIx? I also have the CD-4 and Q8 conversions.
Mostly, I prefer the CD.