All CSI series and 24 are shot on 35mm film then telecined to HD. They're not shot on HD cameras, so there's no need for producers to attempt to achieve the "film look". Some sitcoms such as Two and a Half Men are shot on 35mm film.
There's no indication that any major American series and sitcoms will be moving to digital bandwagon any time soon.
http://motion.kodak.com/US/en/motio..._Boyce_talks_about_formats_for_television.htm
Film is still far superior to current HD technology. Even Super16 produces a superior picture in terms of actual spacial resolution compared to Full HD.
Digital productions can try emulate the look and feel of film, but film has a specific look that is native to its technology and stock and it's that specific look that producers want.