Here I am with the first findings.
I dare to post the shots here even though I know that this thread is named “new 55” but since I posted some shots comparing 55 with 50 ai-s (on the 5th page) I think that I could round it up with some shots taken with 50 ai.
Due to cold weather combined with corona virus restrictions I do not have any photos of people, so I used what was within my reach. Empty beer bottle (that was a really good one - won world beer competition in its class in London 2019). This is shot fully open. 55 would show internal flare, but here I basically see none. I’m very pleased with the outcome. I basically cannot say otherwise because I already sold the 55.
Second shot is taken at f2. Pretty sharp.
I will try to use it for portraits as soon as possible.