I believe the weight (and price) difference can be explained by ef 50 1.2 having a great deal of aberration, while the RF is nearly perfect.I agree with you, there are lenses to be designed and made first. But I do believe the F1.2 should be at least a bit lighter. Sonys 50mm shove of nearly 200gr without the compromises you mentioned. Plus, the Canon EF 50mm F1.2 weighs only 580gr while the RF weighs 950gr. Although the RF performs better, I wonder why Canon had to raise its weight by nearly 40%...
Sonys version apparently performs really well for videos. So, I guess the 50mm F1.2 can be improved. I am waiting and wondering to see how much a Sony 85mm F1.2 would/ will weigh. Canons 1.195gr seems like a lot...
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