I have to say, as someone who has lurked on this forum for quite some time, and has been teetering on the edge of purchasing CMFB since release , The graphical fidelity is not my primary concern. What has sold me on, or rather kept me interested in, this series is the stories told through the numerous AARs - the seemingly endless opportunities for success or failure and the comprehensive tactical options. Now, though intimidating to a beginner, the complexity of this game is not what has delayed my purchase; it's how poorly the game runs (at least in my case).
Now admittedly my experience is limited to the CMRT demo, I've yet to try the FB demo, but irrespective of graphical settings I was unable to achieve a frame rate above 30 (with lows in the teens) making the camera clunky and unresponsive. Perhaps things have improved in FB, still I think further optimization (the CM games seem CPU bound) would be far more beneficial than improved graphical fidelity.
for reference I'm running a 3570K @ 4.2 gHz, 16 gb ram, a GTX 970 and off an SSD