I just muted the film I'm watching, and apart from.. What I can only assume is normal sound, it's quiet as a mouse. Can't hear anything from it over my PC, can't hear anything over the film- and turned the PC off, mute the TV, I doubt you'd hear it at all.
And the noise is mostly just from 4K Blu-Rays. Regular films don't cause it to make a whole lot of noise, and neither do games as far as I know.
It would seem so then, with the Stargate Blu-Ray. Since then I've had on Indiana Jones, Star Wars, some 4K films and M*A*S*H, and they haven't had an issue. But for whatever reason, Stargate gives off a "loading sound" during the film, and that's when it freezes for a moment.
But I'd dare say I'm happier, if only for the fact the PS3 was struggling to play most of my discs from anything Paramount. I wondered why Next Generation, Twin Peaks, Turtles and Tintin were having trouble after Raiders- I always thought Raiders was the issue. But seeing a Paramount logo on all their boxes, that seemed to be the connection.
But yeah, it's quiet enough watching Raiders now, and idle- I don't believe I have ever heard anything. The PS4 Pro is much louder. And I think the whining watching 4K films actually stops after watching the film for a few minutes. Either that, or I had the volume too high.