Example pics for extreme HDR 35mm film at similar resolution (pixels can be binned to reduce noise at cost of resolution)? I've never seen any better than what the 810 can do. And note that cooled sensor digital cameras exist, so even better digital dynamic range is possible.

I consider grain to be noise, just like vinyl surface noise is noise. I don't consider any distinctive and "artistic" defect of a reproduction medium to be a good thing.