That is an absolute lifesaver of a solution

remember that Adobe's DNG converter often has updated lens profiles that can permanently fix that vignetting in your raw files!

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OK, they aren't real.  It's a shark exhibit at my local museum.   Very dark in there—I had to rate the ISO at 6400 and 8000. GFX100RF.

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Well thank you all for you reactions, I haven´t found a lot of options to buy a used Mark I and the Mark II seemed expensive even though I´m sure its a very good lense. So I ended up getting the Sigma 17-40 which I have found for a reasonable deal and so far I am very very happy with it. Weight is good, size is definitely ok for me and I love the internal zoom and weather resistance. The sharpness is very good for my taste and the autofocus works awesomely fast for me. Plus the 1.8 is great to have, I really like that option and shoot wide open in a lot of instances.   So in combination with my 50-140 I have no a combination of lenses for concert photography that makes me very very happy currently.    So thats my update, not sure if its of any interest to anyone but I thought since I opened that thread I wanted to give it its due diligence.