Long time ago I abandoned Xara and moved to Illustrator full-time.
I managed to solve all problems I had encountered with, but several things still bug me.

One of them is this:
https://illustrator.uservoice.com/forums/601447-illustrator-bugs/suggestions/31525333-minus-front-on-grouped-objects
https://illustrator.uservoice.com/forums/601447-illustrator-bugs/suggestions/32954797-pathfinder-must-work-with-group-as-a-single-object

The other one is a crude antialiasing.

See attached images.
Zara puts more shades of gray to show the slope of test line, while AI leaves more uniformly filled areas. It gets more noticeable when angle gets sharper.
Changing antialising options doesn't help.

Please, make antialiasing better.