"There are other companies besides Sony that make sensors - but what quality? what levels of research? what kind of quantities? "
Apart from Canon there are only two major chip manafactures Sony and Kodak and there about both equal in technology and amount supplied.
Unless Sigma come out with something new and better or drop the fovian chip I suspect they will be the first casualty of the DSLR market
Hopefully more will survive as a one or two horse race can only ultimately be bad for the consumer.
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