As a long time GIMP (& Inkscape) user I've been exploring Krita. It has two main points. Short term, Krita tries to be more of a painting tool for artists creating from scratch whereas GIMP is more for editing.
This matters: in the industry those tools are specialized.
Long term they're moving like mad, adding features like decent animation tools, and caring a lot about the interface for non-programmer users. I think they'll become the number one #FLOSS art app.
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