300mm f/2!

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Originally Posted by wickerprints

But those are cinematography lenses--they cast image circles that are significantly smaller than what is needed for a 36x24mm sensor. And even then, with the smaller format requirement, the 150/1.2 weighs 8.8 pounds!

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Actually, at the 150mm focal length, you get a 36x24mm image circle for free. There would be no weight difference at all if it was designed for full frame, APS-C, or even a mobile phone or digicam. The only time there is a difference in weight is when the focal length starts getting close to twice the format diagonal (and it really gets bad at half the diagonal).

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Originally Posted by wickerprints

I think it's safe to say that if Canon ever made such a design for a full-frame 35mm camera, and included USM and IS, it would weigh a lot more....

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The IS might add a half-pound, but USM wouldn't add anything. The manual focus features on cine lenses probably weigh a lot, though.