What the judge actually wrote, for example, about the fair market price for the Superman movie rights, is that there was no perfectly analogous property for determining its value, and the best comparison he could come up with was X-Men:

"Given the close proximity of the Superman initial option payment to that found in the film
agreements for the lesser known comics mentioned above, the value of well-known properties with
great public awareness, and allowing for some inflation of the purchase price terms for the X-Men
film licensing agreement from the mid-1990s (due to the increased interest studios exhibited for
comic book properties at the time), the Court finds that a reasonable, market-driven, up-front fixed
purchase price/initial option payment for the Superman property during the relevant period would
have been somewhere in the range of $4 to $6 million, rather than the $1.5 million in the film
agreement."

Not certain that it's a given that the Siegels get 100 percent of the Superman rights back in 2013, either.