I didn't get down to the demo days this year, or the weather wasn't great. Last year, I took out a GSX-S750. It surprised me in that the inline-4 was still usable 'putting around', though wasn't as happy about it as the SV. More the 'sewing machine' sound than the 'thump' of the V-Twin... But once you started revving it, MUCH faster acceleration. Better suspension and brakes... Thicker bike, so not quite as nimble. It had been one I was really looking at in competition to my SV, so I was happy to get the chance to ride it. The 1000 would just be more of the same, with more toys and power.
I think those bikes are more for those that enjoy the 'thrill' side of things at a faster pace. And can afford the higher price and running costs. The SV does the same things, a bit more slowly. VERY hard to beat the value, though! I was just talking to my father yesterday about how the SV might possibly be my forever bike. I get on an open road and get the urge to nail the accelerator and I just... don't. Oddly enough, there also happens to be a cop waiting just over the next rise, etc... The SV can be playful and 'commute' at 100MPH if you desire, which is enough for many.