Nope. Can't even remotely agree, based upon my Galaxy S8+.
There is nothing remotely grainy about Samsung's current QHD+ AMOLED displays. The level of detail and sharpness is insane for a phone.
Today's AMOLED displays have nothing in common with the pentile displays from 2011 when they looked like this.
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Different? There may be some aspect to it that is patented by Apple and not available to other manufactures.
You act like there is no precedent for Apple putting a twist on something conventional. That's pretty much their standard operating procedure.