I'm honestly curious, as maybe I'm missing it, but what are they doing that you feel earns them the title "industry leader?"
Getting the rules early:
Wizards said they were going to send a copy of the rules to publishers that wanted to produce material for their game. They failed to do this.
Paizo said they were going to send a copy of the rules to publishers that wanted to produce material for their game. They did this.
License:
The GSL is very rigid when compared to the d20 license. It is clear that Wizards wants greater control over what others are producing with their system. While they have the
RIGHT to do that, it stifles creativity. Stifling creativity is not a mark of a leader.
The Pathfinder Compatability license is comparable to the d20 license. They choose to afford their licensees as great a degree of flexibility with their material. Additionally, the license allows someone to simply remove the PF compatible logo from the book and still sell their product.
PDF and electronic books:
Wizards shut down all pdf sales despite the fact that all PDF sales are the fastest growing sector of the market (granted they are not the same size as print books, but it will continue to get larger).
Paizo not only gives away PDFs to subscribers, those PDFs are fully book marked and the system books are internally linked for even quicker reference for important terms. Paizo has also said they are looking into the epub format for their fiction line. They are willing to deliver the content their fans want in the form they want.
Electronic Tools
Wizards does have the edge in this respect, mostly. Their character builder is quality. You don't need to own a book with it.
Paizo does not have a similar product as the character builder. But they do have their system fully on the web. Additionally their community use license is such that it allows a fan to create their own web reference guide (and actually be better than Paizo's). All the open content is available on the fan's reference site. Paizo has even said that their bestiary 2 will be fully open content and allowable for the previously referenced fan reference website.
3rd Party Market Penetration
Several publishers have stopped producing material for 4E because the sales are not what they need. Pathfinder's 3rd party sales are rather healthy.
Accessibility
I miss Scott Rouse. He was a good man and even though he was not frequently on ENWorld, he was here. I will admit that I do not spend as much time in this area of ENWorld much these days (I spend more time in the PFRPG area), but I do not see many people from Wizards here when I am here. I will admit the possibility that they post here regularly and I am simply missing them.
Paizo's people I see regularly. Paizo understands that one of the things that helps drive their fan base is how accessible their designers and editors are on the web.
Compatible with Another Company's Product
Paizo choose to make their system backwards compatible enough that you could use existing material for it. When most people sit down an old system for a new system. Paizo choose to make their system work with a system that was abandoned by its original owner. This made a library of 8+ years of book non-obselete to those that followed. They were not the first to do this. OSRIC, LL, and others all did this. But Paizo did it on a scale not seen before. They lead a different direction than what had been done before. And others followed their lead.
There are others, but these are the ones I can think of off the top of my head.