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I've programmed Aqua, Macintosh Quick Draw, Windows GDI and GDI+, Qt, and .NET Winforms and WPF is by far the most sophisticated API I've used. Although it has a pretty capable feature set that's better than preceding technologies such as swing, it's no match for WPF. It solves some major problems that have plagued graphics programming. If you're coming from the HTML/JS world, it is easy to learn, but if you're coming from the traditional graphics programming world, it's a major paradigm shift. Regardless, it's much easier to learn than CSS/HTML/JS. It's a clean break from the legacy concepts which plague other graphics programming environments.
The biggest strength of WPF is that it's resolution independent. It can scale across devices with little to no modifications. It requires little work to take a screen version of a drawing and output it to a high resolution printer without resolution loss.
It also supports event triggering. UI elements can respond to events of other UI elements or to your applications code, making dynamic interfaces possible. It makes it easy to separate your code from the UI in a way that even HTML/JS can't achieve. Elements can broadcast and listen to events and respond accordingly.
Another strength is its highly object-oriented and declarative capable API. Using XAML, you can easily construct a working interface quickly and efficiently with a few lines. Unlike HTML/JS, it is easier to learn and its output is far more predictable and efficient. You can even program WPF completely in code, but it's generally not worth the minor performance gain. A better method is to compile your Xaml into .NET code.
In addition, the tooling available for WPF is very extensive compared to JavaFX. There are tons of tools including Expression Blend available. There are also numerous tools for taking vector graphics formats such as SVG and Adobe Illustrator and converting them into XAML. Now, designers and programmers ca