I bought an iPad pro the other day, along with the apple pencil. It's proving to be a great tablet for sketching on the go or for when i'm chilling on the sofa and don't feel like sitting down at the desk to work on the Cintiq. Now I have no excuse!
I'm using procreate which is an awesome app, super intuitive and fast, with great brush presets for sketching.
Here's some sketches from the train trip too and from work.