[Brightcolours]

Nitpicking.

There'll be enough vignette on the edges to they'll probably all have the same exposure except for the center anyway.

Still, I think having a 50/1.2 in there makes sense and that's what Sony should've done too.

Fun fact, Canon only had a 50/1.8 and a 50/1.0 for the first 6 years of their EOS line. 50/1.4 came out in 1993.

With vignetting, the center gets affected anyway.
Sony uses a too small mount, which means a LOT of light loss due to vignetting, at larger apertures. That is why Sony uses a LOT of extra amplification on their FF models when using big apertures (compare the results of a 50mm f1.4 on the A7/9 range, and on for instance a Nex-5R.)
So, for Sony it makes less sense to have a 50mm f1.2, their mount simply is too narrow and a lot of catseye will be seen (like with the 50-55mm f1.2 lenses of the 60's/70's).
The wide Nikon Z mount does make a 50mm f0.95 lens make more sense than a 50mm f1.2 on Sony E-mount...