Potential rival indeed
Affinity Photo and Affinity Design are hand in glove with each other and they both provide a commercial alternative to their Adobe counterparts - Photoshop and Illustrator. In fact for me, Affinity products get rid of some of the feature clutter that makes Adobe applications a bit tardy in the workflow area for some projects.
I do tend to use Photoshop more for concept work and if I'm wanting to integrate 3D in art - Photoshop does handle nicely. Affinity Photo is fast and since I'm a huge fan of Affinity Designer - even over Adobe Illustrator I will try to use Affinity Photo for some concept work and see how it goes.
Serif has been for many years the lesser known name behind some great shareware and some nice home craft products, but also Serif Draw was a solid solution in its time. Serif products were often seen featured on the Cover CDs of Computer Shopper and PCPro Magazines in the 90s. I should know ... I helped put them there. :-)