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Just thinkin. A canon 500mm 5.6 lense with no IS. Wouldn't that be a bad azz lightweight BIF lense?
The Sigma 500 f4.5 is pretty close to your spec:
3,1kg, no IS. I used it for a year before upgrading to the Canon 600 f4 IS mkII. The Sigma is sharp when focused accurately, but lack of IS/OS is a killer, at least with my preference for hand-held shooting.