Here's a link to some basic testing done and evaluation. There are a lot of comparisons out there. For most uses the differences probably won't show up, but if everything is done specific to the steel (heat treat, etc) it seems like S30V comes out ahead in most cases. ...again if you don't use it to the max, any difference may not show up....

http://warrenknives.com/blade%20steels.htm

http://zknives.com/knives/articles/knifesteelfaq.shtml

http://www.seamountknifeworks.com/articles/S30V.pdf