It's worth pointing out that the EOS-mount Kodak DCS Pro SLR/c also predated the Canon 5D. Apart from Canon's 1Ds, the other early 35mm-format digital SLRs were the Contax N Digital, which is now a mythic antique, and the other Kodak DCS models, which were generally unimpressive. And the Pentax MZ-D, which was never released to the public and may or may not have been built in functioning prototype form.
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Nitpicking
It's worth pointing out that the EOS-mount Kodak DCS Pro SLR/c also predated the Canon 5D. Apart from Canon's 1Ds, the other early 35mm-format digital SLRs were the Contax N Digital, which is now a mythic antique, and the other Kodak DCS models, which were generally unimpressive. And the Pentax MZ-D, which was never released to the public and may or may not have been built in functioning prototype form.