There's still lots of reasons to get a 2520 - 4G connectivity and 16 hour battery life (with battery cover) are the two biggest reasons. I've never seen the HP, but I'd bet money the Nokia has superior build quality (I'd also bet the HP screen is inferior). Plus, business users will find the claim of an empty store to be overrated. I was shocked to find an app for professional financial planners in the store, for example, and most everything else can be done in the browser.
The 2520 is my daily driver because I run of energy before it does...