Well, I find that any scan of a print falls far short of the quality of image from a negative or slide scan, and that is what I post in my gallery. No one has complained yet.
As for a scan of a negative, then the dmin and slope of the negative curve determine the dmax of the positive image you obtain. However, the Dmax of the positive is adjustable by the scanner software, and this is because of the variations in negatives, and the "color" of the B&W negative image that can be obtained.
So, the bottom line is that with good software, the Dmax of just about all scans can be adjusted to be the same. In terms of darkroom work, this is the equivalent to increasing exposure and contrast. This may indicate that the films are over or under developed. It is impossible to say without tests though.