I'm going to guess that the differences between the glass and plastic are going to be insignificant when compared to the differences caused by randomness in the manufacturing process. I've seen different sharpness and vignetting characteristics among a wide variety of the Holga 120N, so I think that it really depends on luck of the draw, so to speak.
That said, I did find this comparison article that may interest you:
Dead Link Removed
That said, I did find this comparison article that may interest you:
Dead Link Removed
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