That Pioneer comparison screen has something wrong, in other images from the same setup the colour balances between the displays had not been so much off.
In th epic posted here, the right pic seems to have more bluish color balance, while in other screens I've seen it's the BD that seemed to haev the display setup to emphasize blue (it's a known fact that a slight tint towards blue makes the image appear sharper)
Anyway, in the closeup pics there really doesn't seem to be that dramatic difference between HD and SD, the difference definitely is there and absolutely visible to naked eye, but as it's the finer details that are affected, many people could view them and not notice else than slight improvement in "overall clarity". The advantages of HD in movies are really not seen on closeups of faces etc, but in those objects that are more in the background.