Netflix did even worse than Amazon on Demand. The audio was much less dynamic than with either of the other two services, and the image contained even less detail. Overall, the picture quality was less like HD and more like a DVD upscaled to HD by your TV, while audio quality was DVD-level or worse.
Another streamed title I compared with its Blu-ray version was Amélie, which is available through Amazon on Demand. There was no comparison between the streamed version from Amazon and the Amelie disc. Fine textures in a childs jacket looked clear and distinct on the Blu-ray, while I could barely see the textures on the same jacket with the streamed version. A shot of a concrete curb was flat, dull, and lacking fine detail on the Amazon version, while I could see textures and tiny cracks in the Blu-ray one.
Worse yet, the 2.35:1 aspect ratio image seen on the Amélie Blu-ray has been reformatted to 16:9 for streaming via Amazon. This meant that not only were the black bars gone, but picture content had been cropped from the sides of the image.