I don't use it much for calligraphy, but for digital doodling, I use a Samsung Galaxy Note 8. I think there's a 10-inch that would be even better if art is your main objective. The native S-pen does a really good job though, has at least 512 levels of sensitivity (I think), and there are any number of very decent Android apps to use with it. I mostly use Autodesk Sketchbook, but I've been meaning to set it up as a graphics tablet (Wacom replacement) for working on my computer.
It's hard to imagine a tablet really satisfying in the same way manual calligraphy does. At least for pointed nib calligraphy, you may be practicing letter forms, but none of the technical skills are going to correspond to a meaningful degree. At least, that's my opinion from my (limited) experience. Will be interested to know what you end up going with, and how you like it! Good luck!
