The strength greatly depends on the prompt, short prompts might only require the 0.8 for the intended ink sketch effect to appear and for other prompt might requirement 1.2 for that.
If you reduce the strength enough and add 'cartoon, painting, illustration' you can get a great mix of the 2D sketch and a more realistic images, if you are lucky :)
Also you might want to use a fairly high denoising strength of up to 0.65 for the hires fix.
Usage Tips:
The strength greatly depends on the prompt, short prompts might only require the 0.8 for the intended ink sketch effect to appear and for other prompt might requirement 1.2 for that.
If you reduce the strength enough and add 'cartoon, painting, illustration' you can get a great mix of the 2D sketch and a more realistic images, if you are lucky :)
Also you might want to use a fairly high denoising strength of up to 0.65 for the hires fix.
Please check the example image.