My point is that sigma lenses, have not character. not mentioning that 1 out of 3 or 4 are decent copies.
The sony/minolta and zeiss lenses have their distinctive look, which make them different from Canon and Nikon. Using Sigma defeats the purpose of shooting with a Sony, as its images would look like taken with any other camera with a Sigma on front.
I could understand using Sigma lenses if they gave some interesting character to the images, but they are quite tame.