Could not get pen pressure sensitivity to work. Read a really old closed bug about the same problem and saw that it must be some sort of name problem so I unplugged by other tablet and then Blender started working like it should.
So if you plug in two graphics tablets (in my case a wacom intuos M and a bamboo S) (A good thing in Krita because you then get to have 4 pens at the same time) Blender stops seeing the pressure. I did not think to test pressure on the other tablet, maybe it would still be working there.
This seems to be the case in both 2.79 and 2.8
So another related point, blender only sees one stylus. It does not see the eraser at all. In Krita you can have the stylus be one paintbrush and the erase another paintbrush of your choosing. If you have two tablets then you get two brushes on each tablet. According to Wacom, if I had a pro tablet then it could also see multiple pens on one tablet instead of just one pen.
There is also no way to adjust the buttons and pressure curves in Blender but you can in Krita. I think it is important for Blender to have top quality graphics tablet interfaces as Grease Pencil and sculpture become more important to Blender with each passing year. Krita works very well with my tablets. I think it is a good example of how Blender should be.
Manjaro KDE linux, 10.10.18 2.8 Blender
Douglas E Knapp