Ah you mean it's a better tool than the GIMP for content creation, not that it's the best tool period. I was confused by lumping Photoshop in there in the original statement. (I'd consider Photoshop more like a combination of Krita and the GIMP [i.e., Photoshop is a raster graphics program with both painting and photo manipulation tools], while Illustrator is more analogous to Inkscape [both vector graphics editors])
Well, Krita is easily the best painting tool I've ever used overall. I'd put it above everything for painting/creating raster art. Dunno it it's provable but it's a very, very good tool.
