It's just the angle. Wilder's upper body has always looked pretty strong though. He doesn't have huge muscles but he's got some, no fat, and a big frame. Just like basketball players.
I've always found the insistence that Hulk is incredible a bit weird. People don't always describe Spider Man as amazing.
What difference does it make if Wilder says "I will concuss Mr. Fury to the point of unconsciousness" or "Me mad, me knock gypsy to sleep"? When it's all said and done, Fury will be knocked out by Wilder. Besides, I don't watch boxing to listen to great orators.
Only similarities i see are that both turn green, one with rage and one with envy and jealousy of a certain British world champion super star. I suppose another similarity is that Lou Ferrigno was a fan of Duck in Cherry sauce and Wilder is a cherry picking ducker.
''Never let the truth get in the way of a good yarn'' is one all promoters take to heart. Love that movie. Thought he was going to end up being huge in Hollywood.