I think it's worth saying that things improved for me significantly after I started asking myself a similar question. What made my supervisor so much better researcher than me? Not only he seemed way better, but it appeared that everything he did was done effortlessly and stress free.
As it turns out, it is a very complicated question with a simple answer: self-training. But, I thought, and I wasn't the only one in the group, that it must have been some sort of unusual ability he was most likely born with.
For instance, he would write a paper in a few days and it would always seem beautifully crafted and my calculations seemed to fit just right in the context. At the same time, I used to agonize months over just the introduction.
But, as I got more experienced, I realized that as far as calculations went, I was just as good as he was, if not a little better in some ways. Originally, I though that's my only strength and I played it the best I could. Because of that, I started asking myself why I'm still so far from him in terms of academic prowess.
But, after finishing my last postdoc, I became fully independent and had to come up with research themes, write grants, lead research projects and train people. With each new type of task, I had to enlarge somehow my capacity. Things that my supervisor did to approach these tasks formed the starting point for my own approach. In some ways, I've become a lot more efficient than I ever was, because I had to. For example, now I can put together a decent grant application in three weeks, while it took me over a year as a postdoc not to come up with anything that would remotely look like a research proposal.
So, I think your question is a great question. You should not get discouraged if your adviser seems so much better. At this moment, it would be hard for you to comprehend what makes him so much better, because you haven't have the time to even try all the things he needs to do on a daily basis as an independent researcher. But, as you grow yourself into one, you should keep asking yourself what makes other people better at the type of task you are trying to do, and I'll assure you, some of the answers will help you to improve yourself significantly.