Is it mostly based of preference? The one's I know by name are Canon, Sony, Zeiss, Cooke's, Leica's, Sigma's, Panavision, Arri and Rokinon.
I like the Zeiss super speeds because the smoothness of the gears whenever on I'm on a follow-focus rig. Also the sigma's quality I really love. Rokinon's are pretty decent for their price when you need to get something like a knock-off zeiss, I've heard people say. I own two Roks, really are impressed with them.
So all in all, does it comes down to preference/price? or are there more factors?