Mypaint has infinite canvas and the ability to limit the gamut of your colour palete which Krita doesn't currently have. I would say Painter has a comparable brush system - Krita has some brush engines that Painter doesn't and vice versa. I think that krita has better workflow than the most recent version of painter I owned (8) and I suspect that is true of the current version. Krita has hands down the best fullscreen paint mode I have come accross to date.
Originally Posted by dee.