FSX Does the whole planet. The amount of data to make it look photorealistic like WE all want would be incredible. COD only has to get a small slice right.
That IL2 1946 pic Looked really good! Its holding up very well me thinks

If 1946 had the damge model and the engine management and the great cockpits of COD I would still be flying 1946.(Actually I am still flying it)