Was sitting in the dentist's chair today having a crown so unfortunately, I didn't have the opportunity to test out the new lens. I've been sitting on pins and needles after reading so many complaints from users that the lens is not sharp wide open (or at all) or that it focuses slowly. Well, this afternoon, I had the opportunity to test it out with a couple friends of mine in late afternoon light on a cloudy day (so, higher ISO's). After about 100 shots, I was quite impressed! The 186 acquires the target quickly, follows accurately, and produces high quality images. Of the series of them running, jumping, or standing, almost all were in focus with perhaps 2-4% where the focus was not quite perfect. Is the AF as fast as the 400 f/4.5 or 800 f/6.3? No, but unless one was comparing it side by side, one would never know. Anyhow, apologies for the subject matter but here are a couple representative samples at different focal lengths. Say hi to the dynamic duo and no birds were harmed in the filming or production.