Help - Purchased NIB lens on ebay and now testing - Canon 100mm 2.8L Lens Test

so i used the star chart and the lens seems centered just find.. now i'm concerned with if it's symmetrical or not..here are are the top and bottom left & right corners using the ISO 12233 chart... any thoughts does it look good to you guys? at wide open the top looks more in focus than the bottom... i'm clueless if that's to be expected or not.. thanks so much in advance!https://ift.tt/2I5M1Fo (@ F2.8)https://ift.tt/3afH1Ke (@ F11) via /r/photography https://ift.tt/2wiaGEc