In reply to fozmeister:
I've owned Scarpa, Sportiva and Boreal and not really noticed any difference between them as far as the "stickiness" goes - more from fit and sensitivity.
The Mythos were great when they were new, but have now stretched and have been resoled and are the ones I can wear all day and use for instructing and easier or slabbier routes.
My Lasers were, until I lost them, the tighter fitting, less sloppy ones I chose for harder routes and ones requiring more edging and more "accuracy" of foot placement. Certainly an element of psychology in knowing I wasn't wearing my comfy old carpet slippers on an E3!
When I used to work in a climbing shop, I got asked this a lot and used to advise that people should buy them based more on what actually fits their feet than what the hype says in the comics, as there are vastly different lasts between makes and models.
It used to be rumoured that even climbers sponsored by other brands used to send their shoes off to be resoled in Stealth rubber, but I'm not convinced that most mortals would really notice much difference, apart from in the rigidity of the shoes, as a whole, and that, perhaps, lending itself slightly to certain types of routes. Beginners with feet that aren't used to the strain could benefit from stiffer shoes, experienced climbers with stronger feet should be able to climb in anything.
Temperature is a big factor in shoe performance, so you'll feel different in a hot summer to a cold day, but I havne't got time to start on that!