There are other APUGers who can answer this better than me, but by and large old films were much grainier for a given speed (before WWII, to get maximum quality out of 35 mm meant using an ultra-fine grain film with a speed of ISO 10 or so and then developing it in a speed-loss ultra-fine grain developer which took the speed down to around EI 2). They were also more heavily coated, popular roll films were often double-coated with one fast and one slow emulsion, this was to create greater exposure latitude, essential with fixed-exposure box cameras. I have never shot with Kodak Non-Curling film, but I am certain this was designed first and foremost to give exposure latitude and with the expectation that box-camera negatives would seldom if ever be enlarged. Legend has it that old-time photographers were highly skilled at estimating exposure, I have printed negs going back to the 1860s and the over-exposure was appalling, so thick emulsions were a must. Granularity was such that most photographers accepted the view that use of a format smaller than quarter-plate (3 1/4 x 4 1/4") meant a severe loss in quality. In big sizes, old-style emulsions had a very interesting quality - Ilford HP3, for example, which I used a lot in 4x5" to 8x10", had a very useful ability to hold highlight detail due, I believe, to the flattened-off shoulder of its characteristic curve. The oldest paper I have personally printed on was Kodak paper from the WWII era, paper bases I think were generally heavier, also coating weight, but the main difference was the colossal choice of weights, bases, emulsions and surfaces in which printing paper (bromide, chlorobromide and chloride) was available for both enlargement and contacting.