As Andre already said this is a question of the lenses and in this case it is called BARREL DISTORTION and second I measured one of your photos 80mm? f1.2?and we are speaking of a distortion of 0,44%.
18pixels on the full distance on the upper border.
and the 50mm f1.2 has a deviation of 30 pixels at full length which are about 0.74% distortion.
Take a look at the page Photodo
and there you can see this deviations.
I think you overreacted on this issue or I do not know what else you had in mind.