since a few weeks i am playing with a FOV of 80 - which is the highest FOV possible to choose in this game. i think it's harder to aim, but i like the speedy feeling with higher FOVs. and now:
a few minutes ago player "HyperEnergi" ranted around because of my FOV, called me fov-noob and said it's the same thing as using scar+laser+aim-enhance.
i don't think a higher FOV is an advantage (especially not an illegal), but i ask myself what other players think about this...