Glad to hear you've been listening
While the perfect sensor doesn't exist, a good sensor exhibits read noise that is normally distributed, or thereabouts.
The latest sensors...like the IMX224 (in the ZWO ASI224MC) have <1 e read noise in high conversion gain mode.
Previously I mentioned that another factor in getting good results is to know the equipment and play to its strengths. Regardless of what the read (or thermal) noise behaviour is, once you know what it is you can expose accordingly and overcome it
There's a lot of fun, and some pretty amazing results, to be had from inexpensive equipment!