this was a darker scene of the movie, however i personally think this manip shows that using less cyan actually adds to the majestic feeling to the suit... you can have a dark feel and still have "darkly-bright" colors...
this is why i think making the suit dark to begin with is a mistake... when you make the suit darker from the get-go, when you film the suit in a dark setting, you lose almost all texture and visibility of the suit. for those who have seen that short 3 minute release footage from Superman Returns released by Sony Entertainment, before the filters were put in place... the colors were beautiful, but when you see Superman carry Lois into the clouds, you lose all detail in the cape because the cape itself was dyed a very dark red, a wine red in some cases.
if you have bright colors to begin with, when you film dark scenes, the light will be able to bounce more easily off of the colors, so that you dont lose detail. Plus, in post-production, you can go into the film and change the colors alltogether respectively to whatever color palette might suit your fancy. At the same time, while you darken the vibrancy of the colors, you can still keep the reflection of the light all at the same time, so while you darken the color of the suit, you dont sacrifice the detail of the suit and the reflection of the light off of the suit... and even if you want to get rid of some of the reflection, you can do that as well.
it's a win-win situation, and it's incredibly simple, not to mention probably cheaper... i dont know why film makers dont do this.