althor, finished to download the test clip - if you can call it a "test clip" a 1GB file... (^^,) - and it's quite good; a bit too bright, but maybe it's the disc itself...
Meanwhile, thanks to the capture fever that hit me, I managed to grab the same frame you posted before, this:
US HLD-X0 Vs US CLD-R7G
http://screenshotcomparison.com/comparison/129269
and this is the results:
US HLD-X0 Vs US HLD-X9
http://screenshotcomparison.com/comparison/129450
US HLD-X0 Vs JP HLD-X9
http://screenshotcomparison.com/comparison/129452
US CLD-R7G Vs US HLD-X9
http://screenshotcomparison.com/comparison/129451
US CLD-R7G Vs JP HLD-X9
http://screenshotcomparison.com/comparison/129453
I used both the US Definitive Collection (0693-84) Japanese Definitive Collection (second edition, the one without book but with documentaries -> PIL-2021) because this is the latest version and is supposed to have a better video.
Hardware used: Pioneer HLD-X9 via S-Video Monster Cable to SweetSpot (a.k.a. PDI Deluxe)
Software used: VirtualDub with HuffYUV 2.2 codec; settings for JP: http://s11.postimg.org/d834rlmlv/SW_DC_JP_settings.jpg (for US, contrast was lowered to 95 and of course NTSC was used instead NTSC-J)