I'm not really sure what you guys are worried about. I just checked my copy and it performed like drzenitram's.
The one thing that does help as with any f/1.4 lens is using AI Servo mode, especially handheld.
I tested mine at f/1.4 at a range of distances from 10 feet to 150 feet and the majority of my images were very sharp at their focus point at +3 MFA on my 5D3 using a single point focus mode.
I'll attach a few of them so you guys can see what I'm talking about.