First, I think there are plenty of examples on this forum if you look closely. I don't have any direct links handy this second, but hopefully someone will post some examples.
Second, you mentioned "30 FPS", but that is a worthless spec most of the time. Keep in mind that FPS is not the same thing as shutter speed. So the fact that you run 30 FPS does not mean there is any difference in quality from someone running 15 FPS. In other words, 30 fps does not mean 1/30th of a second shutter speed, nor does 15 fps mean a 1/15th shutter speed. The only difference between 30 fps and 15fps is the fact that you are just recording twice the amount of data and therefore using twice the harddrive space at 30 fps. If you are recording a highway where cars are passing by at 70 mph, then a 30 fps(or faster) recording might be appropriate. However in 99% of the home use cases, there is no reason to record at 30 fps because the subjects we are capturing are traveling at slower speeds and therefore there is nothing lost by only recording 15 frames per second vs 30. It all depends on the purpose of the camera. For example, a license plate camera capturing vehicles on road with a 45 mph speed limit will need a much higher fps rate than your "driveway" camera is going to need. Your driveway camera can easily get away with a 10-12 fps capture rate and still capture more than enough information, while a camera at your front door can record even fewer fps and still be effective.
Third, as far as which cameras provide the best low/no light performance, it really is just a physics problem. You can look up the sensor size (at least reputable companies but the sensor size in the specs. There are unreputable companies that still try to hide this information) and resolution of a camera. Divide the area of the sensor by the number of pixels (ie the actual resolution of the camera) and that give you the area of each individual pixel. The larger the pixel, the more light it is able to absorb in any given period of time. Cameras with the largest individual pixel size will generally give you the best low/no light performance.
Far too often people think higher resolution means better cameras. Normally it is the opposite. Most consumer grade 4k cameras have relatively small sensors. This, combined with the high resolution/number of pixels ensures poor low/no light performance. A 1080p camera using the same sensor will perform much better in low/no light than the 4k camera will.
