For what is most important, I would say equal tie between centering, focus and printing (marks, dots, the color job). If all three aren't really good I won't even consider the card. I have too little money and there is too much nice stuff to buy a card that is little too "off" in a category. Now, about corners, they have to be simply decent for the grade. The corners kinda sorta have already been taken into account with the grade on the slab. But the grade on the slab doesn't always take into consideration the centering (60/40 vs 55/45 vs 50/50), focus, and factory slight print blips
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