Yes, I like the 20/1.4. The Sigma Art 20/1.4 is the only 20mm with f/1.4 around. The quality of the lens is better than previous lenses I have used from Sigma.
It takes some time to get used to a f/1.4 in the wide 20mm range, as you collect a lot of light. I previously only worked with f/2.8 or much slower in that region.
I would like to know how the 20/1,4 would compare with the Nikkor 20/1.8, strangly enough I never saw a good comparision.