Respectfully I would modify Roland's recommendation about ignoring bokeh remarks. I would suggest that you 'take them with a grain of salt'. Just be sure to check a variety of images made with these lenses and decide for yourself which type of rendering you like. Dave seems to imply discussing bokeh is 'nonsense', whereas in fact it is a real phenomena in photos that is evaluated subjectively. Whether the type of OOF rendering is pleasing or not in a certain lens is not nonsensical to determine, it is just something you will need to decide how much importance it will have in your shooting style.
As you state, you love to shoot at night and indoors, the f2,5 would be a very limiting lens.
I think your interests dictate a choice between the 1,4 or 1,2 noktons. I think as an all-round lens the f1,4 is the better choice due to size. That said, if you check the M-mount group on flickr like Roland suggested, you will see in the images there why the f1,2 nokton is highly desired: the rendering! Between these two lenses, you have a half-stop differential, a size differential and lens rendering difference.
I don't think you can make a bad decision 😉