I would take a wider pancake, sure.
How bad would be the vignetting be?
(I mean, the RF 15-35 f/2.8L IS is still out there, and from what little I've seen, correcting the vignetting in those shots is like a DPReview EXMOR shadow push demonstration. )
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I think that a wider pan cake for FF need sth. like two-digit numbers for vignetting. For vignetting the old EF mount needed more distance between back lens and sensor so they had to bend the light at steeper angles which reduces the vignetting.
Think about f/2.8 20mm which would be the equivalent to the EF 40 (because of flange distance) and a simple construction you would have ~45 degree incidence. Check that in real world trying to view into a cars windows while you have bright light outside.
IMO the new RF mount has the POTENTIAL for BETTER IQ in wide angles and - this was never mentioned - it has the potential to make much smaller 50mm or 85 mm lenses as tele construction (positive front group, negative back(?) group) but for the wide angle section you need larger lenses if you want reasonable vignetting.
Or ... but that is another construction site ("eine andere Baustelle") .. you need sensors which have less reflection under flat angles of incident light ... and maybe Canon is working on that because they have some lenses of high IQ with vignetting on the higher side. The RF35 is one of these lenses.
It would be a big move if Canon has solved the problem with the strong reflection of off axis rays under flat angles: The sensor helps to simplify lens design or to allow better correction of other lens aberrations or have both: simple well corrected lenses!
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