So as Hamilton has won races and is challenging for the title, then let's put him aside him in that poll or discussion, as you like. He has more or less proved himself already with results.
But let's talk about other newcomers (2006-2007), who have so far achieved just one podium altogether and let's compare them and their potential.

Kubica, who has shown to be a strong rival to Heidfeld.
Kovalainen, who has recently had the upper hand over Fisi.
Rosberg, who has firmly beaten Wurz.
Sutil, who has looked very fast in the slowest car.
Davidson, who recently has put in several good performances too.
Liuzzi and Vettel - first of them beating the highly rated German, but the latter is still trying to adapt to F1.

All of them look good drivers if not amazing talents. What do you think, which one of them has most potential in future terms? Who has impressed you most? How good anyone of them exactly is?