Even with component, given the choice between the 59avi and 47ai, the 59avi is better. The 47ai has a few issues with video, most notably the CUE (chroma upsamling error) bug. I have a 47ai that keep around for "secondary" audio, the video is no longer as good as other players (ignoring the CUE bug).
The 656a is not a US model, correct? What US model is its peer? If I had to guess, the component video of the two (656a and 59avi) would be closer than the audio (59avi being better). However, in either case, it depends on the rest of your equipment if you'll be able to notice a difference, and if so, how much of a difference.
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