I just got my new Canon 50mm f/1.2L lens, and after taking some picture with 1.2 aperture the main subject is clearly OUT OF FOCUS, I think the main reason is that at 1.2 the DOF is super shallow.

I was reading that the Canon 7D has the Custom Function to do a AF Micro adjustment to the Lens, do I have to do it ?, or I should send the lens back to Canon for proper calibration ?, what are my options ?, thanks a lot

I would need to see the picture you're speaking of, but at f1.2 you're not going to get a face in focus (If you're doing the a portrait). Trying opening it up to 7-8ish and see if your subject is more in focus.

I am focusing on the letter "H" in the keyboard, as you can see the row on top is in focus, please check the attached photos

The equation (Math) is too difficult to explain, but when you begin to stop down the focus goes a little forward (Towards the camera) and little bit and then some backwards. I think your lens is fine.

I had to do the microadjustment for one of my lenses and there are good instructions online on how to do it with Live View and a focus chart. The pictures though don't look that off. Maybe back focusing a tiny bit, but the focus point at that angle may have picked up the edge of the key instead of the H. What AF setting are you using?

did you take the picture handheld? Then it's really easy to just get a small movment forward (just 1 mm is enough) and the focus will be "of".

Here are the results from the Micro adjustments to my Canon 50mm f/1.2L Lens at an Aperture of 1.2, I really do not see a huge difference and I would say at 0 Micro Adjustment the photo looks perfectly fine, what do you think ?, the Micro Adjustment sequence of the photos is the following, also the photo name has the value for the Micro Adjustment in the name:

0 +15
+5 -5
-15

Micro Adjustment = 0

Micro Adjustment = +15

Micro Adjustment = -15

Canon 7D + 50mm f/1.2L Lens at f1.2

Same camera and Lens, but now changing Aperture from f14 to f1.2:

Another example of aperture change