Moth3r said:

For ESB, generally the NTSC master is better...

Ouch, I thought it wasn't even possible for a transfer to have more DVNR-artifacts than the NTSC Empire. Almost every scene on Dagobah and Cloud City is horribly affected, especially when Luke first meet Yoda and when Luke encounter Boba Fett until he leaves the city.

Moth3r said:

except for the instances where bright lights are moving at speed which results in the weird artefacts seen in the Vader's lightsabre and the Millennium Falcon's engine. The noise reduction hardware probably had different settings for concealing light scratches and dark dirt spots.

Interesting, that also explains the faint weird dark pattern that appears whenever the sabers clash in the film other than what has been documented already. I recall that 005 thought it was dirt or something stuck in the composites in his comparison thread. (something you not notice if you don't go through it frame by frame)

I do remember that your PAL THX ANH preservation looked very nice, you need to do a comeback Moth3r. :)