@Cosk It's a focusing issue - within a few metres it's not too bad (especially now that I've micro adjusted on the 7D), but anything with a bit of distance, say 6+ metres and its open to guessing what it will do - in/out focus. I cant trust it.
Maybe I've got a bad copy.
Be sure and rule out user error first. This is especially true if you're getting OOF at wider apertures at those distances. Just something to think about.