Just finished a three-way comparison of the new SE DVD compared to the original non-anamorphic DVD and the AC-3 Laserdisc.
I used Chapter 12, "Red Light, Green Light" for the testing. All audio testing was done at THX Reference level, without engaging any Re-Eq. (calibrated to 75db)
I was surprised at how lacking the 5.1 on the original DVD was, a decline in quality similar to the original "Star Trek: Generations" DVD. i.e. rolled-off frequencies in the lower and higher portions of the track. The LFE was downright limp.
The new SE DVD, when A/B tested with the LD, seemed oh-so slightly lower in volume, with a +1 increase in volume, I was hard-pressed to notice any variance between the two tracks.
The A/B switching was audio only, switching between the two synced tracks through my receiver.
On a video note, with the LD out of the equation, the original DVD was similar in color saturation, but detail was highly lacking, due not only to the non-anamorphic transfer, but a sheen of video noise and block artifacting. This was exaggerated further when I engaged the zoom mode for the proper ratio.
(Boy, is this a dry sounding post or what?)
I noticed some EE on the SE transfer, nothing overly objectionable. Your mileage may vary on larger displays (I have a 46" 16:9 Toshiba 46H84 CRT).
Could it be a bit sharper? Yeah, but this is a marked improvement over any previous incarnation available, and the first time it's been far more than watchable on my system for some time.
Hope this helps,
J.W.