Thanks for the comparison, very informative. SO we can use whatever FOV with almost same quality.
I would add that WIDE FOV is not suitable for portraiture (generally speaking, I do weddings) because it distorts in the corners very much. And when you try to straighten the lines in PP (After Effects or GoProStudio, that is) things become worse, you lose a big portion of frame and what is left is poor in terms of quality and unexpectable in terms of perspective.
On the other hand MEDIUM FOV is far more tolerant to corrections leading to more useful footage.