They sound a lot better, more accurate reproduction of the original sound wave, in theory anyway.
EDIT: I'd say the higher production values of the DVD-A and SACD stuff gives far more improvement to the quality of the material than the actual underlying technology though, I don't think I've ever seen a real study that shows anyone can tell the difference, and I know of one study that shows people can't tell the difference between a high quality source and that same source downsampled to 16bit/44kHz.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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