That's because the Epson doesn't resolve the grain. It's granularity that starts to look bad first when sharpening. Thus, the Epson scan can take more sharpening.
But why are you worried about any of this? You have an 850. Why not just get to taking pictures, making scans, making prints? These type of nuance questions can only be answered by each individual. Do the work, and make your own decisions.
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