C – older, Compur shutter with limited or no lens coating.
CT* – same as above with multicoated lens.
CF – same as CT* but with Prontor shutter and redesigned barrel (more rigid).
CFi – same as CF but upgraded Prontor shutter (lasts roughly twice as long) and better flare suppression due to better internal barrel coatings
CFe – same as CFi but with electronic contacts for use with 200 series.

The flare suppression on the CFi/e matters for longer focal length lenses in high key situations — i.e., where there is a lot of white background in or just outside of the picture. The upgraded Prontor shutter only matters for professionals taking 1,000’s of pictures — the CF can handle roughly 200K exposures; the CFi/e about 400K.

Hasselblad 500.