Bought a 5D3 and a Sigma 50 yesterday, and after a year with te Sigma 30 and no micro adjust on my 550D, I am loving the feature on the 5D.
I have only had a small play around with it though, and amazingly the Sigma needed +20 to get the focus close to spot on - I even think it could do with a little more.
Should I be keeping it as is with MA+20? Or should I be I unsatisfied and get Sigma to adjust the lens for me?
What is the process - do they need to keep my camera with the lens while they repair it? What's the downside of keeping it on MA? Is there any downside?