My ISO is not your ISO. Each camera has a different ISO for the same setting, say ISO100 will look different on different cameras, even from the same brand.
My Nikon d5100 gives garbage on anything over 100, my A7iii can still look good at 6400, my A7Rv I dislike anything over a few thousand.
Each camera behaves differently, and the what is acceptable also varies on the available light, a brighter scene with a high ISO can look cleaner than a dark scene.
It's all highly variable.
Done that, I also went to a Sony event the other week and spent so much faffing around to get my spare camera set up for my partner to tag along I forgot to pop a battery in mine..