I find the typical 14mm 2.8 milky ways boring. Not many stars (only 5mm entrance pupil). This could be better with 1.4, but it is also only 10mm....
The main part of the milky way of the center bulge you can easily fit into 35mm. I did that with the EF 35 IS:
But I had to use f/3.5 for that because of coma reason. This was EF, I didn't try it with my RF 35 1.8 yet.
So it would be much better, if I could use f/2 or even f/1.2 of an RF35mm. 29mm entrance pupil would bring out so much more stars, not only the possible decrease of exposure time....
But coma is the key issue always... But if they build IS inside an 14mm I don't know what the reason is? Handheld astro without tripod? For architecture you can profit with an IS, but there you use f/5.6 or more always,...
What am I missing?