I put this together for my own edification and reference. I believe in trying to get objective information whenever I can in life. Such info may not be the whole story, but it's a good place to start. I don't put much stock in individual's observations, so many variables and skill sets are in play, to say nothing of meaningless descriptors. Ilford does not release this type of information, although I found RMS granularity for the FP4+ movie film. If Fuji is to believed, they have the best films for a given speed bar none. For any given film speed, they claim quality equal to everyone else's one speed lower. Frankly, I don't believe that they alone hold great film making secrets. In fact, I garnered enough information on the Acros rating to see that they used a proprietary developer - probably never seen on these shores - and then rounded down.