It brings in a good collection of filters to choose from and also provides the ability to control layers in an image just like Adobe Photoshop. It is similarly extensible with the use of plugins or extensions. Recently, it introduced render animation capability, full support for OSX, enhanced color picker and more. Also, you could argue that Krita provides a better user interface compared to GIMP. It definitely offers a range of features and is constantly developing as we talk. However, more focused for use by illustrators, cartoonists, and concept drawing artists.
To our surprise, it still is not like GIMP. However, it turned out to have a lot more potential to be an independent desktop application competing with programs like GIMP. Krita was meant as an add-on with KOffice to facilitate image editing within the suite of office tools. Yet another impressive Linux tool for digital artists.