I don't understand how an alder body is a "step up" from a basswood body, the 505 comes with evo's and the the vine isnt any better or worse its based on preference.
First of all, the 505 does not come with DiMarzio evolution pickups. It's pickups are stock Ibanez V series.
I agree that the tone difference between alder and basswood is subjective; it's hard to prove that one is better than the other. While the vine inlay doesn't affect tone, it's more decorative and labor-intensive. I don't know if alder costs more than basswood, but the vine definitely costs more than the dots, and there's the point--the 505 is obviously designed to be the most affordable Japanese JEM possible.
I like the idea of the 505 being basically a prestige guitar, but . . . If it had some better inlays then I might like it more.
Then buy a 7VWH.
People, Hoshino Gakki and Steve Vai are giving us a choice between two good guitars. The only choice that we can't have is the deluxe model for the mid-range price.
EDIT: To answer the OP's question:
How much diffrence is there in a jem jr and 505 . . .
It just depends on what you value more-- looks or country of origin? Oh, and maybe choice of fretboard. The 505 is Fugijen-made, Prestige quality, but plainer inlays/hardware, and stock pickups. The Jr. has the look of the top-of-the-range 7VWH, but since it's Korean (Indonesian?) it's cheaper.
For me, I'd rather have the Fujigen product and upgrade the pickups later. I know others will want the vine, great. Go for it.