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You are absolutely right - negatives are different and one should account for it.
And your observations are very similar to mine!
Thank you for sharing :)

Processing negatives is not such difficult. But scanning is not a very interesting job: all I think most of the time when doing that is getting the best digital archive I can and never having to bring out the original again...
The link to the V500 sample did not work. The online editor of Ipernity does not work properly, and if you notice an erroneous link then correct it, the previous version re-appears instead of the correct one. The link is www.ipernity.com/doc/francois_collard/15081963
(But maybe only a copy in my browser cache was not modified and obstinately reappeared when I refreshed the page).

I hate scanning my negatives :( Some of them I leave unscanned at all - I do not put much faith in digital storage media ;)

I hate scanning,but I'm more confident in digital storage than in any other (not on hard disks, that will necessarily die), provided the CD, DVD or Blu-Ray where I store my photos, programs or documents are checked, say, every five years, and at least copied twice. I have had a CD burner since 1997 (then DVD, then Blu-Ray burners). Nearly all disks I burned are still legible. When there are read errors they are often due to my bad handling of the burner at the beginning, sometimes the quality of the media (which is seldom linked with the reputation of its brand: on the contrary, reputed brands often do dangerous innovations that may endanger your data).
Hard disks are comfortable, and I even added recently to my computer a 2Tb internal drive for my photos and videos, but I don't consider it a real digital storage, just a way to have my files at hand. But I noticed that few people stored their files on optical disks. They often lack the basics of disc burning. Even my 37-year daughter, who is very comfortable with computers, asks me when she wants to burn even a simple audio CD. I suppose burning discs went out of fashion, and people are too confident in hard disks and pen drives.