Those SOW models look very different than the il2 birds. Why and where you are now asking, so take a look on the details, a much higher polycount on nearly every object, covered with highres textures. The technik in wich way those models where modeled is a bit different, they used much more details and attention to the objects. They are looking awesome!!
Maybe if you where a modder or someone who works with 3D tools you would recognize it much earlier and would think .. oh damn great work!!! If not, you need some time

just sit back and wait until the final product arrive. I have no doubt about the final product and quality of the ingame models!