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Interesting information... thanks for posting. I definitely see more coma than that with my Canon 24 f/1.4 II, but when I'm taking night shots I am typically using a higher ISO and a longer shutter speed so that will automatically make the coma a lot brighter by comparison. My most common setting for aurora photography is ISO 1600, 8 seconds at f/2.0. It would be interesting if you could try that with your lens (and also try 4 seconds at f/1.4).
I am at the St. Pete Indy Car race this weekend. Will give a try Sunday night and post.
Other than monster light pollution... and 2 meteors :) in the upper left corner
I did the 1600 8 seconds f2. then dropped the exposure time for the 1.4 shot to 1 second.
You might be able to interpolate to the other shots.
https://www.flickr.com/photos/77760916@N05/
I have to say that it looks really good, and to my eye it is better than my Canon 24 f/1.4 LII. There is less coma, and everything is wildly sharp. Even your coma is sharper than my coma. I'd say you definitely have a keeper with that lens! Thanks for posting these results.
I am happy with it, haven't had enough time with it alone in the woods.... :)