I would hardly call a jagged shadow more detailed. Hell, I'd argue the opposite.
For example 1024x1024 shadowmaps without soft edges and/or jittering will look worse than 512x512 soft/jittered shadowmaps. But to low shadowmap resolution + soft edges/jittering will look bad in motion becouse you will see "steps/blocks" of the shadows whenever the shadows move.
But looking at comparision 1 they seem to have same shadowmap resolution but xbox360 has soft edges (or maybe just the angle that masks it?).
Shot 1.
360 lacking mapping/same detail on the clothes on middle guy?
PS3 lacking same intensive lighting for light source?
PC and PS3 jaggies visible on shadows?
Shot 2.
PS3 less AA and less moon glare?
PS3 lacks some vegetation/shrub on the ground to the right of the gun?
Shot 3.
PS3 more pronounced mapping detail or just "angle for the moment" situation?
PS3 more aggressive LOD for mapping/texture (ground/rock) under the tank/above the middle guys head?
Shot 4.
360 more grass, longer draw distance for grass?
PS3 and xbox different vegetation color/lighting?
PC has better LOD for bushes (left corner)?
360 more "trees" on the right side (thin "ropes" or whatever they are called)?
Shot 5
Difference in the LOD for tree at the top right corner?
360 has less (lower res) or no mapping on the shoe?
PS3 fire effect resolution lower (windows)?
PS3 less AF (middle ground textures)?
Shot 6.
360 and PS3 differences in mapping on soldiers?
Interesting and good screenshots to use for comparision.