[Axial]

Well, I wouldn't even begin to compare the SoW engine to the Source engine. Simulation games focus on "large scale" realism and detail first, since that is what you see most. Engines like Source, which are focused on action games, put small-scale details ahead of the large-scale ones. That is why flight simulators have always appeared to lag behind their contemporary action game peers with regards to detail; the small stuff isn't as important as the large stuff and because they have to do the large stuff, there generally aren't enough resources to accomplish that and the small stuff.

Having said that, the SoW engine is unlikely to be used for anything other than simulations because it won't be tuned to deal with excessive in-your-face detail like the newest iteration of Source (see Portal 2 pictures), CryEngine 3, etc. Thus, SoW and Source shouldn't be compared because it's like apples to oranges.