I more agree with this.
This is kind of a weird comparison, but I'll use it anyways:
I've played a lot of Call of Duty in the past, and in every one of those games, no matter what the background scenery was like, you could always tell a player apart from the scenery. No matter if he was hiding in the deepest, darkest bush in the map you could still distinguish his body easily. It was annoying in that game since it made camouflaged hiding useless, but it would work very well in DCS for the planes.
It's hard to describe. It's almost like a "shiny-ness". The textures used for players seemed very different from scenery textures. CoD players should know what I'm talking about.