history: My friend who trains with me has been training for the same amount of time but looks much better than I do. I have a friend who's been weight lifting with me for years now and he looks better than me. I wish I had his genetics!
current: Oh, I totally understand.  It's frustrating when you feel like you're putting in the same effort (or more!) and it works better for other people.  
next: It sure is frustrating, but I can't say I haven't made great progress myself. But his progress is insane!