5D3 same max dynamic range as the 5D2???

[Astro]

There are slight differences in banding vs. fixed pattern...I believe they are caused by different gains at different parts of the pipeline. The fixed pattern stuff is finer and cross-hatched, and pretty much always the same in every frame. Whatever causes banding is different, and the banding can change frame to frame. As far as I can tell, the fine, FIXED PATTERN noise is gone in the 5D III.

FPN is caused by physical non-uniformities at sensor level.
it can be easily removed because it does not change.

[sndan]

http://www.flickr.com/photos/trentchau/6861371280/#sizes/l/in/set-72157629637172995/

A GREAT DIFFERENCE

[Aglet]

random banding is more likely caused by power supply instabilities or other system noise creeping into the sensor signal path.  comes down to proper electronics design and shielding.
I found noticeable random horizontal banding in some older bodies I tested, like the 40D, when pushing shadows.
Makes me wonder how well it'd perform if the internal power supplies and shielding were improved...