I think bzhyoyo has nailed it!
The airframe detailing looks raised, like through a combination bump-mapping &
specular and/or materials light mapping (the wrinkled canvas, panel lacing,
the fuselage/fuel tank brackets look wonderfully 3D):
I like the shade of British PC10 too.
Anyway, these new special effects add so much to diminish the flatness of previous textures!