Pressure sensitivity was my dream when using different drawing applications in iPad. I used to use Wacom Bamboo Stylus to make my sketches in iPad and I always felt the lack of pressure sensitivity, then came the Intuos Creative Stylus by Wacom but it had a very crap feature of AAAA battery which highly scarce in India. Now they have come up with Intuos Creative Stylus 2 with rechargeable battery and sharp tip, this one looks promising waiting for it to be released in India.
Intuos Creative Stylus 2 + Procreate (integration coming soon) will make a cool artist.

“Creative Stylus”