Call me crazy, but I think the picture You_too posted already has a lot of detail? Keep in mind that that picture is NOT 1080p. But 1280 x 544

What are you comparing the quality to anyway? If it's the official blu-rays, well you can't really expect these captures to have the same quality.

1.) They're using homemade equipment to capture the frames, definitely not perfect. (altough really good results anyway)

2.) these are NOT the original negatives, which is what the blu-rays were made with. These 32mm are basically third generation, so they're gonna look a little "softer"than a direct o-neg copy.