Most "Hollywood" feature films and one-hour narrative episodics are shot with film. As HD technology progresses, some features and television are using electronic acquisition.
There aren't compiled statistics, but in my twenty years of experience on hundreds of sets, Panavision equipment has by far been the most popular and used. Arriflex is second and others, like MovieCam and Aaton, show up from time to time.
As technology and economics evolve, most film equipment companies have devoted resources toward developing electronic acquisition tools as well to compete. So, Panavision has offered the Genesis, while ARRI offers the D21, and new cameras, like RED, are new tools for the cinematographer.
As of this moment, though, if you were to walk onto every feature film set around the world, you would likely see a Panavision camera being used as the "A" camera. Panavision has "Panavised" other cameras so that they will be more useful for Camera Assistants.
Indie (Independent) filmmakers are usually on a tight budget, so on those sets, you'll see a large variety of cameras now that "24P" is within their budget. It's for that reason that most film festivals around the world have adjusted to allow digital screenings for movies.
Los Angeles, California
IATSE Local 600, SOC