Digitize the grain?! - Can you please expand/explain what you mean?
The grain, as everything else in the movie, is stored in digital format on disc.. you're NOT projecting analog film when using blu-ray. The digitization process has occurred when the film was scanned and then mastered, this happens regardless of which player you end up using to reproduce the content at home.
Oppo has the ability to do DNR, which can affect film grain depending on the setting used. You might have enabled this feature. Also, the Oppo CAN use contrast and color enhancement features, but you have the ability to disable these features as well. The default is to have all these features disabled.. can you check to make sure they are disabled?
To jump in... To some (and I stress some) of us, it appears that the 103 QEDO chip is applying some DNR even when set to 0. This is admittedly a
controversial topic on the owner's thread, but I will say that I see it in my 103. But that could account for the OP seeing more grain from his Panny.