Py36 could you say somthing about the neck of the Jp compared to the RG520 even tho it might not say so much as the jp7 is bigger/wider then the jp6 i was thinking of.
I suspect the jp6 neck is smaller then the wizard you got on the RG520.
The JPXI-7 has a 20 inch radi, and you can feel it. It feels amazingly flatter than an original wizard (I thought before I tried the feel from 16 to 20 would be negligable but its there...). The stainless steel frets are spoiling the hell out of me as well.
The width feels almost the same as my old 7620, just a bit different....The back of the neck is assymetrical so I cant even compare it to anything else, its very new to me. The XI, and 12 are completely different from every other JP due to these specs. When the nut has some sauce in it the trem is the biggest surpise. It stays in tune very well. Gilmourish use, warbles and even flutters will not throw it out of tune at all. Dive bombs after a few times will but thats to be expected.
The biggest difference is the tone. Again its hard to compare to but between the Alder body, Mahogany tone block, Ebony board and Mahogany neck its got amazing tone. You just cant get a bad sound out of it. It has a tight neck pocket, the construction is as you would expect from an EBMM.
Saying that, the 520 has an original wizard spec neck and it feels better than the '90 RG750 I used to own, its very nice for bunch of different reasons.