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Few lenses deliver good sharp focus when used wide open.That was at 2.8 (max for this lens).
That's why experienced photographers usually stop a lens down at least 2 stops when they want tack sharp focus. Most lenses will deliver their sharpest focus at around f/8.
What are you going to use an 85 mm f/1.2 for? Many struggle with focusing issues using a f/1.8 lens because the DoF can get extremely shallow at wide apertures, though a f/1.2 lens a minimum of 2 stops down would be at f/2.5, but would still likely deliver it's sharpest focus at around f/5.6.