Besides, he didnt change the Superman suit that much did he? This thread alone shows that he, or someone else, did look to the comics for inspiration at some points.
There's not a person in the world who doesn't know Superman's suit, and Singer's reverence for the Donner film would be a factor in him not changing it.
There are several points that make me wonder if Bryan Singer has read a Superman comic:
-Magneto leaving Xavier to die at the end of X2: In the audio commentary, he said he preferred this over the Magneto who oftentimes led the X-Men. This shows he had to have read MANy X-Men comics to be familiar with that period and to have read other periods where Magneto was the arch enemy to differentiate the two versions of the story.
- Showing an awareness of eras and story arcs works against him in his portrayal of Lex Luthor, who has largely been a deadly serious character for decades. Researching the source material would show that his comical(albeit with a dark edge... some of the time)Lex is not the lex many readers 30 and under have known their entire lives. The Lex Luthor of the comics, whatever version, was smart enough to not have to marry to get money, even if he worked within the law to get it. The Magneto reference above shows his awareness of different versions of a character; his Luthor was largely the Donner Luthor.
-His saying in several interviews that Superman can only be hurt by kryptonite, so you have to hurt him emotionally for drama. Ummmm... Brainiac, Metallo, Mongul, Darkseid, Doomsday, Parasite, Cyborg, the Eradicator. I guess those didn't ring any bells for the director of Superman Returns. I certainly can't find any direct quotes from him referencing Brainiac in any context.
-The X-Men movies had numerous Easter Eggs that referenced comic characters not in the movie and the such. The only Easter Eggs were former Superman actors in this. A reference to Cat Grant or Bibbo, Intergang, Morgan Edge, etc would give me a little more confidence in Singer.
Superman has lifted huge rocks many times before. When I say Singer obviously hasn't read many Superman comics, I say this largely because of what he did with the X-Men movies and the telling quotes from him.
You can make the argument that X-Men had no movies to draw on before Singer made his while Superman has a very influential one, but Singer should have realized that the 78 movie was not the be all and end all of Superman.