Quality had nothing to do with it. Sony bought off more DVD manufacturers and so-called "rightsholders" and paid them to exclusively make BluRays and specifically not to make products for HD, supported by every other non-Sony product maker.
But those manufacturers - Toshiba, Mitsui, etc, - either didn't or wouldn't pay off the same studios. They bought a few alliances, but not enough.
So BluRay won not on quality comparisons, but on the pay-offs and bribes. Standard operating procedure.
Now, we'll pay Sony to have them recoup their "investments", and more of their artists will lose more royalties than ever before to under-the-table skimming. Support BluRay and rip-offs!
(I keep cheering for the Chinese to overwhelm Sony with THEIR marketplace and THEIR own corruption methods. Their EVD standard sounds great - but it's at least 10 years old and never made it past a sheet of paper.)