Thanks! After doing adjustments for positions and brightness levels (the X0 was set to black at IRE 0), I can compare them directly. ld-decode is a bit noisier and the comb filter misses a couple of spots, but it holds up alright I think...

http://screenshotcomparison.com/comparison/128827

Neither one is as detailed as the film sample, of course. I'm too lazy to resize and color correct it, but viewing that .jpg at 1280x580 versus the LD screenshots reveals so much more detail especially on the droids.