James Allan has an interesting table on his blog explaining how many positions drivers have won/lost this season at the start of the race:
Gained:
+26 Massa ***** *******
+24 Glock
+22 Kovalainen, Senna* *****
+21 Alonso
+20 Perez***
+14 Vergne
+13 Raikkonen
+12 Pic
+9 Karthikeyan
+5 Maldonado****, Kobayashi****, De la Rosa ****
+4 Hamilton, Schumacher* ******, Hulkenberg
+3 Di Resta *****, Button
+1 Petrov***** *******, Vettel
Held position:
Lost:
-3 Grosjean** **** *****, Webber
-5 Rosberg
-13 Ricciardo*
Suprised at Massa being top but I guess he would be with how he has qualified for most of the season relative to the car's pace!