sopdf just converts one PDF into a differently formatted PDF. All it does is trim the edges and cut the page into two chunks.
It has nothing to do with Sony, though it is designed for that size screen. I think it would work fine with other readers, though I've only ever used my Sony.
One nice feature sopdf has over PDFread (or another I use: PDFLRF) in that it doesn't convert it from text to images: it leaves it as text. It's probably the conversion to an image and the resulting pixelation/rasterization that you noticed.
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