Superman is always as strong as he needs to be to beat any foe. Superman Prime and Silver Age Superman are unmatched by Sentry, Hulk,Goku, etc...He can't even be erased by the Anti Monitor or any others for that matter. I'd do a little more research into Sups before making assumptions. Silver Age can pretty much create new abilities to beat any opponent. Prime is indestructible by any means so nice try Marvel.