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Kobalux & Avenon are the same lenses sold under different names. I've handled the 21 and 28 when i was in Japan but didn't buy one. I find it interesting in the review that the vignetting doesn't improve when stopping down.You may have meant to also include the Kobalux 28/3.5 ltm. It is a very good 28mm lens. I sold off my Canon 28/3.5 ltm and kept the Kobalux and the Rokkor-M 28/2.8M.
https://casualphotophile.com/2020/07/01/kobalux-wide-28mm-f-3-5-ltm-lens-review/
In any case in this thread i was looking for info by those who'd used the Canon LTM 28mm lenses