Do remember that some parts of Paris were Chirac's 'fiefdom.' Without him it will be interesting to see how things go.
Paris proper was, yes (but not the extent that the Correze (and some areas bordering on Correze) was. Curiously Francois Hollande's seat is in Correze) but Paris is not the entire Ille de France; Sarkozy himself is based in the inner western suburbs (Hautes-de-Seine).
Might as well add that about the other candidates... Royal is based in Deux-Sevres and Bayrou is based in the Pau area. Le Pen is from Morbihan but he never does very well there (better than the rest of Brittany though).
Not sure where Besancenot or Laguiller are from, Buffet is a machine politician based just outside St Denis, Bové is (of course) based in Aveyron, Voynet used to have a seat in Jura (based around the amusingly named Dole), De Villiers is based in the Vendee.