Curl at the back of the neck is flat on top. But I think that's because of a slightly less than full strike, not wear. I agree with -58.
I'm not sure about that diamond. Could be a small hit. Took some more pictures but they didn't come out very well. I always get better results with natural light. Getting this close isn't pretty and now I think I may be seeing something going on with the 4 . Check it out, tell me what you think