Granted Vinge is some 20 odd years younger than Asimov, but I'm not sure I'd contrast either Vinge or Robinson as new or contemporary sci-fi (still great, though, no argument there).
Maybe Alastair Reynolds, Charles Stross and Ian Banks could be singled out as being "new hard sci-fi"?
More in the same age as Vinge, I'd also mention Nancy Kress.
Even William Gibson and Bruce Sterling are approaching retirement age these days...