I'm late to reply to this, since I've actually been on vacation with this lens. Just back from Turkey where this lens was the workhorse. I've noticed no focus noise with this lens, but then again I don't shoot video, so really not that important to me. The lens is quite sharp and I'm really happy with it. One thing that did come up a couple of times during the week was difficulty focusing when shooting into the sun with low contrast. I would imagine that an Olympus lens wouldn't have this problem. Easy to correct by going wide locking and then zooming back in and relocking. I would also say that generally one has to be careful with the focus with this lens. Though rare, it sometimes misses focus. All that being said to me these are minor things, and I'm extremely happy with the IQ and build quality.