I'm a bigger fan of just de-noising video, and leaving it gone. I don't want it replicated, UNLESS the de-noised video is such a low-bitrate blocky mess that you absolutely NEED the noise in the video to hide it.
Conan The Barbarian DVD is the noisiest film I can think of off-the-top. Strong de-noising makes it look far, far better. But just about every movie out there benefits from modest de-noising.
If youre into horror you should take a look at Hellraiser. Good god is that a noisy film. I know there are a lot of purists when it comes to film grain but that film needs some denoising applied
Conan The Barbarian DVD is the noisiest film I can think of off-the-top. Strong de-noising makes it look far, far better. But just about every movie out there benefits from modest de-noising.