It does appear Cerebus is still the more valuable of the two Bronze Age books in high grade.
But I don't think anything comes close to this:
http://www.comicbookdaily.com/collecting-community/overvalued-overstreet/overvalued-overstreet-star-wars-1-35-cent-price-variant/
I don't have recent data (the article is a year old), but this is from the article:
"Recently a CGC 9.4 sold for $26,290, which was up from the previous record of $23,000 which was up from $11,131 months earlier."
How much did this CGC 4.0 actually get? Astonishing money for a 4.0:
http://www.ebay.com/itm/Star-Wars-1-35-Cent-Price-Variant-0-35-Marvel-1977-CGC-4-0-Old-Label-/201896297276?hash=item2f01f5033c:g:aOgAAOSwRUhY9isF