From the Pixelmator blog in the upcoming release:

Pixelmator Photo is a powerful, beautiful, and easy to use photo editor for iPad. It features a collection of nondestructive, desktop-class photo editing tools, a set of stunning, machine learning-enhanced film emulation presets, a magical Repair tool to remove unwanted objects from your photos, support for editing RAW images, and more. Simply put, it’s best way to edit your photos on iPad.

Add that to what Affinity is doing and Adobe is about to do, and it’s pretty clear that in a pretty short order the iPad will be the best photo editing device you can buy. Especially when you factor in a like system with a Pencil like device. Amazing.