I'm fascinated. I can't even describe how great this is, the ammount of awesomeness in this is too high! :D
I felt like I was watching some fight sequence from a big movie or something. Saitama vs Hulk all the way.
Impressive ammount of detail! There just two things that I think you could consider if you'd like to improve the climax in your fight scenes: I'd suggest making the overall fight a little bit shorter and change some things up, like different locations, more unique powers etc. At the start when they were still in the city I was quite intrigued watching how everything progressed and then came to the actual fight.
But as soon as I was like 10 minutes into the fight, it got somewhat less exciting over time. I love the ammount of work you put into your animations, but I think you could save some time by abreviating the fights slightly and just switch things up here and there after some time. It just gets a bit... well, stale, seeing that same rocky landscape and those punches over and over again...
Either way, great job on that and keep going! Love the content you're posting. But I hope you'll be considering some things I've mentioned, since I think that they could be worth experimenting around with ^_^