I'm a loyal Paint tool Sai user and this is what I use mostly for illustrations.
But when I started doing webcomics, I had to switch to CSP since it's a powerful program with lots of features for comic-making.
However I still find the pen pressure settings lacking not in terms of tweaking features, but it just doesn't have that same feels as Sai brushes.
I tried many tweaks on my brushes to make them feel like my Water brush tool in Sai.
But the pen pressure in CSP is not dependent on the actual "pressure" but more like how small or big the pen tip strokes get depending on how soft or hard you press your pen on the tablet. Unlike Sai where soft strokes makes light colors and harder strokes gives out more paint/color (IDK if I'm making any sense lol)
IDK if anybody else notice this, esp those who switched from Sai to CSP