Hello, I recently purchased a 50 f/1.4 to do some landscape and architecture work with 5DMKII. Having shot about a thousand frames with this lens I have found many times that the AF fails to lock correctly in very simple and obvious scenarios (good light, plenty of contrast, no back light etc). Especially the peripheral points refuse to focus correctly and the image is very soft. I can post some examples later but here is one case, in the photo below I was using the right AF point to focus on the tower and just found out that photo was OOF. I tried defocusing the lens and moving the focus point around and took about 25 shots, most of which or totally soft. I finally gave up and used manual focus and got everything sharp as you can see here: I had similar results in different situations today as well. In the past I had used MKII with 70-200 f/4 IS and 24-70 L and I did not notice this issue but I hadn't extensively used the peripheral points either. I have done the AF test with close 45 degree target and there is no systematic front or back focus that would require MA. Any thoughts would be appreciated.