A quick muckaround with one of the first images I took with my 5D MkII on the day that Humayun and I went to pick it and his new 70-200L 2.8 lens up. The image was taken pretty-much after dusk and it was raining profusely. A nice intro for a new camera - LOL! Anyway - the point is that there was hardly any colour in the original as it was nearly dark.
I really, really like some of the tools - selection in particular. Adjacent pixel selection tolerance is performed on the fly in real time by moving the mouse left or right - and you see the growing/shrinking selection in complete preview - not just a thumbnail that Photoshop uses. I like it more and more as I discover new tricks. The developers have really put some thought into the interface.