I have EMGs in one of my 520QS's, stock pickups in the other one. I actually like the one with the stock pickups better, it's very bright and mean sounding. However, that guitar is, for some reason abnormally heavy (in terms of physical weight.) I haven't weighed it, but it is definitetly noticeably heavier than all my other Ibanez's, so that may have something to do with the tone I get out of it. Maybe the wood it's made of is just super- abnormally dense or something. The one with the EMGs sounds darker, and plainer, and doesn't have the cutting high end of the heavy one. I'm talking about the bridge pickups here, I don't pay too much attention to neck pickups, to be honest. Not to say the one with the EMGs sounds bad, just the other one sounds spectacular. I should mention those are mahogany bodied guitars BTW, but otherwise very similar to an RG(1)570.