Is there a difference today that wasn't there even 4 or 5 years ago? The main difference I see after visiting their site is that it's impossible to see how much Qt actually costs now.

It's still listed as a commercial product when undertaking commercial development, requiring a license PER developer. If I'm not mistaken, this used to be around $6000 per developer for cross-platform deployment (Windows, Mac OS and Linux).

Another difference I see is that they have some ambiguous language about charging you even more if the UI of your application is controlled by Qt. Whatever that means.