German amateur boxer Emanuel Odiase, who stands at 6'8, has sparring experience with big name heavyweights like Anthony Joshua and Deontay Wilder.
At one time Joshua vs. Wilder was one of the biggest fights in the sport of boxing.
The contest has certainly cooled down since both suffered stoppage defeats.
Joshua was stopped in seven rounds by Andy Ruiz in 2019, while Wilder was stopped in 2020 by Tyson Fury.
The British star, who regained his titles in December 2019, will defend the IBF, IBO, WBA, WBO titles against Oleksandr Usyk on September 25.
And Wilder will challenge Fury for the WBC title in a trilogy fight on October 9.
After sparring with both fighters, Odiase gave his take on the skills and differences of the two hard-punching athletes.
"AJ is far more technically poised and gifted than Wilder, he's a better technical fighter. As far as speed, I have to say Wilder is the quickest guy that I have been in the ring with. He's the most explosive guy that I've ever been in the ring with when he throws the one-two," Odiase told The Sun.
"The first right hand [from Wilder] surprised me. What's good with me, I'm good on my feet, I'm always moving in, moving out, staying light on my feet like Ali did back in the day. I was moving quite well but in that short moment he surprised me, I moved out, I could see it coming but it was so quick it surprised me. It didn't land clean because I'm a good mover, but his speed surprised me.
"It's hard to say [who punches harder] because I didn't get caught cleanly by either of them, so I can't really say. One thing I will say is that Wilder has in his favor is explosiveness and quickness of the punch. He makes the first step when he throws the one-two so quick, you can't see it coming. But with Joshua, I feel like he sets up his punches better, he's got more punches in his arsenal - jabs, hooks, uppercuts and of course, the right hand. Both have got the power to knock each other out."