Fighter cokpits are often really small, that's for sure. Depends on the aircraft itself, though. Older jets especially have small cockpits, especially lightweight fighters and interceptors. IIRC, the F-14's not too bad, though, because it's designed for longer duration flights.
Of course, there's always my favorite, the Su-32. It maintains the performance of the standard Su-27, but adds a two seat, side-by-side, cockpit, with standing room inside, a sleeping area, an oven, and a toilet!!!! And it has all the usual fighter perks, plus some new ones, like a rear radar allowing it to shoot missiles at pursuers!!!