Such a weird thread.
A) I think your pecs match the rest of you. You look normal, like you don't workout or eat well. I don't have a clue how you came to the conclusion that 40% of your pec is missing, lol. I think you have more fat on the lower portion of your pecs, because that's where fat collects more in general. Maybe that's where the confusion is?
B) how did you come to the conclusion that the rest of you is 'an otherwise decent appearance?' your pecs are just about the last thing I'd be worried about... That 40" waist would be my concern.