If you like a Very Good Read but also want Seriously Chewy Writing, then I have some writers for you, all SF or adjacent.
Ted Chiang - Wikipedia ’s output is extremely small - he has written just over a dozen short stories - but he has received over 30 awards including two Nebulas and a Hugo. (He apologizes for one of them because he was forced to finish it too fast, and I agree it is a bit lesser but still an very good read.)
I recommend not reading any of the descriptions. Start with “Exhalation” or “Hell Is The Absence of God” and just read it slowly in one sitting, none of his works are very long.
Gene Wolfe - Wikipedia is my personal favorite for his incredibly vivid characters and subtle and intricate plots all bearing on some aspect of the human condition. Many of his stories are told extremely elliptically by idiosyncratic narrators with limited views of what is going on, so the reader needs to piece it together, and yet at the same time, they are exciting in an almost pulpy way.
I’d start with the novella The Fifth Head of Cerberus, and if you don’t like the first page, there’s no hope. 
His magnum opus is the Book of the New Sun, a four-volume series. He mentioned the idea to his editor who said, “Send me a treatment!” and quite a few months later, Wolfe shows up with the whole thing in first draft, all three volumes (at the time).
Editor stays up all night reading it and calls him and says, “Sold!” so Wolfe rewrites it entirely from the beginning, and I mean retypes it.
I’ve read it many times and I always find new details and revelations. There are still one or two questions I have, decades later!, but Wolfe did know the answer to those questions.
Cordwainer Smith was “an officer in the US Army, a noted scholar of East Asia, and an expert in psychological warfare. He was one of science fiction’s more influential authors despite his relatively limited output and his early death at the age of 53” and also godson of Sun-Yat Sen and many other things.” Back when you could do that and be a nice guy, too - credited with saving a lot of Japanese lives by writing pamphlets that gave them socially acceptable ways to surrender.
Every short story starting with his first, Scanners Live in Vain, is a knockout (there’s a posthumous collaboration that’s a whisper of him) and they are all in strange and beautiful and extremely modern for someone writing in the 50s and 60s only.
It leads through stories like Golden The Ship Was, Oh, Oh, Oh and The Burning of the Brain to The Ballad of Lost C’Mell which is some sort of revelation of the whole thing.
Start with Alpha Ralpha Boulevard, or Scanners Live in Vain.
Lem, Ellison, Pohl and/or Kornbluth, Sturgeon, I have a list but I’m out of time.