Sorry for making it confusing with that screenshot, its literally just a screenshot of a portion of my screen and i opened them in 2 different media players cause I was too lazy to compose my own side by side comparison. The only thing that is relevant on the screenshot is the quality difference.
Sequence settings are 1080×1080, 2 pass vbr 45-50, square pixels
I guess all I need to know is if I should expect worse quality in 1×1 aspect ratio or not, cause it doesn’t make sense to me.