A long time ago, in a photographic galaxy far away, I worked as a colour printer, doing machine enlargements and proofs for wedding, portrait and commercial photographers who used 120 negative film.
Most of the film was Kodak Vericolour. Some of the film was Fuji. I believe that I encountered some Agfa as well.
Each of the films incorporated an appropriate orange mask, the effect of which meant that the colour response was made more linear. Each required a different, base magenta and yellow correction in order to print as "neutral".
In addition, of course, individual frames might require further correction, due to variation in lighting.
Even under the same lighting (sometimes with the same scenes - wedding parties in the quarry gardens at Queen Elizabeth Park come to mind) you could compare and contrast how the films performed. That was because we were running a completely within spec RA4 printing processor monitored with at least daily control strips, we were using well maintained, voltage stabilized professional printers and enlargers, we were using fresh high quality paper of the same type from day to day and we were printing from negatives that, with one notable exception, were processed by the competing professional labs in our town who also maintained totally within spec C41 dip and dunk lines designed to give top quality to their professional photography customers.
The exception I referred to above was a photographer who, in the interest of cutting costs, was trying to develop his own film. The machinery he had on hand was capable of high quality results, but his knowledge and skills were not. The negatives we received from him were badly processed, resulting in poor contrast, colour casts and, most importantly, real problems with colour crossover. Eventually we ended up refusing to work on any negatives he processed himself.
I bring all this up because it illustrates what you need to reliably evaluate films. If you have consistent, in spec film processing, consistent, in spec printing (or post processing and digital display) and consistent, in spec viewing conditions and you do your comparison under those consistent conditions, you can come to reliable conclusions about the film itself.
The internet display resources provide a very different type of consistency.