Now that you revealed which is which, can you post the full exif data for each of them?

Its seems like each camera used different settings for the same picture, and sometimes even a small change in the position of the camera can make a big difference. For example, it seems like in the flowers shot, the N900 camera focused on the closer trees and therefore the trees at the front pretty detailed but the distant trees came out a little blurry. The iPhone's picture focuses on further away objects, and so the trees at the top right are clears, while the closer trees look a bit blurry.

Another effect is that the proportion of the sky in the picture (slightly different in each camera) can affect the exposure and white balance settings.

Anyway, I kind of expected B to be N900: good color reproduction, good detail, reasonable dynamic range - though not the leader of the pack, and noisy at low light conditions (I guess its because it doesn't use aggressive noise reduction, and a bit too eager to switch to ISO400).