Affinity Designer has some capabilities similar to Photoshop, like bitmap functions. With full compatibility with Adobe’s Suite, Affinity Designer supports standards: 10-bit, CMYK, CIELAB, and Pantone.
With one of the most comprehensive vector design toolsets on this list, plus raster finishing, Affinity Designer might be the alternative you’re looking for. Built and continuously improved as Serif’s pièce de résistance, Affinity Designer is designed to be intuitive for the experienced Adobe user.