also i've seen 3 kinds of fov options in games:
vertical fov (eg. bfbc2, metro)
horizontal fov
horizontal fov based on aspect ratio 4:3 (quake4, cod, bf4, etc)
so at 1080p fov 74 is 90 and fov 90 is 106.
cod probably scales sensitivity according to the q3 formula (not the one for quake live).