Some benchmarks here:
http://www.guru3d.com/articles_pages/call_od_duty_vga_graphics_performance_benchmark,1.html
Performance is pretty terrible at 1200p, 2xMSAA and max settings but Guru3D do state that this is one of the hardest levels on performance and if they're correct that the PC version is running at higher settings than console then that could account for the difference.
http://www.guru3d.com/articles_pages/call_od_duty_vga_graphics_performance_benchmark,1.html
Guru3D said:On the PC, Call of Duty: Ghosts players receive the definitive experience, with assets, display resolutions, and textures that best the 720p and 1080p experiences offered by the “next-gen” Xbox One and PlayStation 4. PC players benefit massively from high-quality, high-precision NVIDIA HBAO+ Ambient Occlusion, NVIDIA TXAA temporal anti-aliasing, and in a forthcoming game update.
NVIDIA wise you'll notice NVIDIA GPU-accelerated animal fur, and NVIDIA GPU-accelerated PhysX effects, but aghain that'll be available in a later TBA patch.
Performance is pretty terrible at 1200p, 2xMSAA and max settings but Guru3D do state that this is one of the hardest levels on performance and if they're correct that the PC version is running at higher settings than console then that could account for the difference.