Re Hanyu, I think he's been overhyped but he is the real deal, a rare phenom. I have been interested in him for over a year since I was first intrigued by something he said involving Patrick Chan. I wish I could read more of his interviews to confirm my impression. My feeling has been that he has a different way of learning, by feeling, instincts, absorption, and by "becoming" his idols/model to pattern after, including Plushenko, Weir, and even Chan. I knew he had the potential to acquire very quickly the best of each of these skaters of different styles and strengths. He has proven my suspicion right with his rapid acquisitions of skills and rise in the skating world. The kid simply has a different mental mode that enables him to learn extremely quickly, including competitiveness. Over this season, he kept getting better and better at each competition, and winning Worlds Bronze didn't surprise me.
I have two main concerns for him, both physical. The first is his asthma and stamina issue. But even that he seems to have overcome somehow over the season. Incredible. Second is how his physical growth will affect him, because he still has the body of a boy, with a big head much like young Patrick.

Of the best quad jumpers, those to whom quads seem to come easily and naturally, he is one of the slender build type like Plushenko and Reynolds who can rotate very fast. (We also have the power type like Stojko and KVDP, and the compact technical type with power like Yagudin and Chan.) As Hanyu grows, he will likely lose some of the flexibility he has now and I don't know if he will need to adjust his jumping techniques to his new mature body. His development is very fascinating to watch.
As to Chan vs Hanyu, Chan is also a fast learning phenom albeit very differently and very consciously. Chan is quite a bit ahead in all areas of PCS and more steady in his big jumps but Hanyu is catching up in competition consistency with experience. As Chan is not static but is still improving in a very fast pace, refining the details of different aspects of skating from the basics he has mastered, it's hard to tell when Hanyu will catch up with him, especially if they both reach a high level when maturity and sophistication matter.