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Re PAL vs NTSC, for anamorphic DVDs the resolution difference isn't staggering, but for letterbox it is huge.
The reason is that the amount of lines left for a scope letterbox transfer in NTSC is only around 277 lines, which is bugger all. (from memory it is around those numbers, I don't have anything handy to check).
So starting from such a low base, any increase in available lines = a massive jump in image quality.
So a PAL letterbox transfer, with its higher linecount should be a hell of a lot better quality resolution wise.
To answer another question, the PAL laserdiscs are more tightly framed, this means that when you put the NTSC version and the PAL version side by side, that some of the picture is missing on the PAL version - you could think of it as the PAL version is a bit more 'zoomed in' so some of the picture has fallen off the bottom of the screen so to speak.