I'm a happy user of Affinity Designer which is so much better than Adobe Illustrator, it's super responsive and quick and got all the tools I need for vector work!
Now I was hoping that Affinity Photo might also be a replacement for Adobe Photoshop, not for working with photos - but for painting, sketching and doing concept art in. After using Affinity Photo for one day and trying to sketch and paint concept art I must say that I'm disappointed.
First of all, the brush engine is really slow - it's much slower than Photoshop and almost unusable on certain brushes (ie: any of Daub's Gouache brushes). I'm running MacOS Sierra 10.12 on an high end iMac retina (5k) - so I was really disappointed on the performance here, since I had hopes of similar speed as i experienced in Affinity Designer.
So my question is - for future versions, are you going to work on improving the brush engine in Affinity Photo ? Or will it mostly be geared towards users doing photo manipulation?