Not there to feel it, but it looks like your timing belt may have been too tight from the direction of the wear. Could you post pictures of the others, and the camshafts?, including the upper cam bearings? I trust you are labeling the upper bearings so you know which go where, btw.
Your title is off, by the way - this is showing wear of your head cam journals so far. Finally, these engines have a reputation for tearing up their cams/bearings and still running fine. So a bit about the miles, condition, history and especially your plans would be useful in advising you.