I bought a set of blurays for the original COSMOS TV series with Carl Sagan. I'm really blown away by the image quality. The old DVD set showed a relatively grainy 16mm image, but this almost looks like super 16 (even though it isn't). You can see lots of detail in the opening live action sequence where Sagan is discussing science and us as a species on the cliff face. The texture of his skin, the transparency of the water, the fabric of his coat, individual strands of his hair, blades of grass and everything else.
Moving into the special effects sequence, the image is far more detailed, showing the limitations of the budget and astronomical photography technology, but also showing the footage of how the editors and production saw it before it went to air.
If you're a fan of science, are old enough, and remember this show, then have a look at it. Really amazing stuff.