Good morning;
An interesting question, and not easy to answer in a simple, straight forward manner. My thoughts are about the pre-AI, the AI, and the AIs series.
Others have already indicated that the tests have shown that the 50mm f/2.0 and the f/1.8 are probably the best performing lenses when we consider lens resolution, with the f/2.0 having a slight lead. Then the f/1.4 has a brighter finder image and is a little easier to focus, especially with eyes that have an excessive accumulation of years. The f/1.4 does give up something in resolution for that improvement in brightness and focusing ability.
Then we come to the f/1.2. This lens has the brightest viewfinder image and is the easiest to focus, especially in low light. If you are using a flashlight to read the dials on your light meter, this is the lens to have. It also has further compromises in the recorded image resolution, and there is the "minor problem" of what it will do to your wallet.
The faster lenses do seem to be roughly equal to the f/2.0 and the f/1.8 when we stop down to about f/5.6 and smaller, as I recall from some lens testing done about 30 years ago. The f/1.2 was more difficult to control with flare, and it benefits the most from keeping a good lens hood on the front in normal daylight.
For me and my eyes, I settled on the f/1.4 as the best compromise for a combination of ease of focusing and lens resolution in most of my selected apertures at an affordable price. In a studio where you have control of the lighting, the f/2.0 would be my choice. For something where you need the ability to focus sharply on a specific plane and have the rest of the image out in the "circle of confusion," then the f/1.2 Noct Nikkor may be worth the money for you. It all depends on what you want to emphasize for your style of photography, and the situations where you will be taking photographs.