Smudge brush engine is difficult to control, so using blending and wet brushes can be difficult at the beginning.
Not the best for pixelart (lines can be jaggy very easily).
has a learning curve with creating brush presets.
Text tools (better than before, still not optimal).
Requires a lot of memory, don't get surprised with lag with huge brushes or canvas also documents taking up 1gb of ram (merge your layers can save you).
Canvas only mode where you can hide toolbars and dockers to have a bigger area.
Wrap around mode (if you are into making seamless textures).
you can also copy from inkscape and paste on krita)
vector tools (although not perfect can be helpful.
highly customizable ( you can change most of the shortcuts).
shift+drag to quickly increase and decrease the brush size.
Assistant tools (a bit buggy but gosh vanishing point assistant tool can be a life saver).
Powerful preset editing (but also complicated at first).
Layer styles (basically photoshop layer effects).
Powerful program (has lots of features and also the gmic filters).
Please note all this time I said brush tips, to use them you will need to create new presets(in krita you create a new one by changing an existing preset and saving it with another name). from what i tested it also accepts older photoshop brushes(only tips not presets) but i couldn't import anything from cs5 onwards. Well first of all i want to point out that krita accepts gimp brush tips and png tips (like medibang), so this opens up to a lot more brushes to use.