I recall a thread that pit Superman against Firelord, and Terrax, and I thought that he would win if he went all out. I stand by what I said in that thread. Superman should be able to get to 4, but outside of that, I believe that 5 is being way too generous. Most High Herald types should stop at 4-5 anyways. This would also depend on how much the writers want to stretch that S, because there were times in the history of Superman, that I could have swore that he was operating on the level of a High Trans, but then again that may just be me placing the beating that he gave Darkseid a bit too high.