In my opinion, it used to be that for the most part PSA and SGC graded about the same, except maybe SGC was a little easier on centering, and stricter on paper loss and wrinkles.
Now, it seems SGC at least on prewar has becomes much looser about corner wear (I see cards with rounded corners in 5s which I find troubling). At the 6-8 grades they still seem to grade pretty much as I would. PSA, on the other hand, has become too strict. I see lots of cards that I would grade 1-1.5 grades higher.
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