Well. the french 5.1 is more than appreciated!
About color grading: it's difficult to say just watching few images... I talked a lot about this, and the question is: which is the RIGHT color grading? The one saw in the theater at the premiere? The one found in the first home video (if different)? The latest one because the director feels the "urgency" to modernize it?
I mean, James Cameron always loved blue, but now this version is teal - that is not *exactly* the same thing... take a look at post #57 where you could find comparisons between R1 DVD/jap HDTV/new HDTV; the red tinted version is the old japanese HDTV.
The problem is: I checked briefly all the DVD versions I have (PAL IT, NTSC US & CA, NTSC R6) and all have a color grading similar to the old japanese HDTV - apart the pink tint that is not so evident; all in all, it seems a "right" color grading: natural when there are "real life" scenes (like in the seaside or aboard the ship), blue in underwater scenes, pink in the alien "ship".
Still have to check laserdiscs, though... PDB, what is your R1 DVD version?