Canon EF 24-70mm F/2.8L USM Back-Focused Issue

I just got my lens back from Canon Service Center today. I sent for calibration due to back-focused issue. This is a known issue for this lens. So I'm not surprised when I found that the image quality produce by this lens is not good enough. After hundred of shots taken with this lens...I finally decided to send my lens to Canon service center. It took about a week for them to calibrate my lens.

Below is the first test shot taken with this lens after calibration..it looks like the subject is in focus. So far I'm quite happy with the results. I will take few more shots this weekend just to confirm the issue has been resolved.