If you had asked this question a few years ago, the sonic difference was minimal. Both Studio and Standard used the 490 and 498 (off the top of my head) pickups, consequently sounding to all intents and purposes identical.
Thesedays though as has been pointed out they put the new Burstbuckers into the LP '02 Standards and the difference is huge. I own a 2002 LP standard with the BB's and it sounds absolutely phenominal, and since it has a lovely honeyburst flame top it looks the part too. Although 1.7k is a lot of wonga, it's still better than between 3 and 5k that you'd pay for a historic reissue, which these are *easily* on a par with.
One thing though, don't buy Gibsons through any mail order place, their quality control is *not* good and there are duff ones about. Shop carefully and you can pick up a beaut. I got mine from Guitar Village and (duff neck pickup notwithstanding, which got replaced when I took the thing back after it's first outing) it's a great piece of wood. Some of the ones they had were not so good (poor fretwork / neck set wrong etc.) but they did have 2 or 3 lovely ones.
Jules
p.s.
indoors / natural light
http://www.slidejules.com/pic.cfm?pic_ID=3036
outdoors / natural light
http://www.slidejules.com/pic.cfm?pic_ID=3035