I don't believe that there is extra pixel data in optically corrected lenses of the same size as the digitally corrected one. We may think that the "light" is more accurate that digital manipulation but the physics still means aberrations.
Can you point to any study/research to show that optical is better than digital correction?
Note that severe vignetting is an issue for single frame astro shots but much less so for panoramas. This is due to the corners being discarded when the panorama is generated - say with a 1/3 frame overlap. The side bits are for the panorama stitching control points but are discarded in the final image. The exception is the top left/right corner of the final merged image where this is not the case.
You CAN Correct It In Post, but . . .
. . . . there is no free lunch. I hear this about 20 times a day and it's true: "Yes, it has a lot of distortion, but that's easy to correct in post." It's a totally true statement. Unfortunately, way too often, the complete statement goes like this: "I got it because it has [...]
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