Finally got the Japanese edition. The master same the same (not remastered) but the japanese edition features more contrast and more definition (5 episodes on a DVD9), a little better than the italian edition (8 episodes on a DVD9) but no great differences.
Japan version: more definition (more grain) and more contrast. Audio japanese only. 35$ per volume (8 volumes)
Italian version: less contrast and definition. Audio japanese & italian. Subtitles in Italian: 40 $ all complete series.
A little comparison, first the italian version, later the japanese:
