Let's look at them one by one using just OBP...
Wilson (I assume Mookie): .314 career
Raines: .385
Lofton: .372
Pierre: .345
Reyes (Jose): .341
Ichiro: .370
And just for kicks, Rickey Henderson: .409
Some people think of the prototypical leadoff hitter as someone who gets on base with a slap hit and steals a base here or there. I tend to think of a good leadoff hitter not as a speedy guy but rather as someone who is able to get on base at a high clip. That's why guys like Rickey and Tim Raines are so good, is because they can actually get on base first before they do all the speedy guy crap. Ichiro doesn't walk a lot but he used to have such good bat control that he'd get his 200 hits and keep his OBP up anyway. The other guys are notorious out-makers. Making outs generally stalls a rally and kills your inning, so the guys with low OBPs who aren't actually that good at defense either, I wouldn't put in the class of Rickey, Tim Raines, Ichiro or even Kenny Lofton.