As gmw noted, I see a huge change in pacing in thriller novels of the last 40 years or so. When I read older books, for example "The Day of the Jackal" from 1971, I am often struck by how much slower they are. Aside from sparser descriptions, modern writing drops us into the action.
When I look at SF, good modern works use much better characterizations than classic 1950's and 1960's stories. The genre is no longer ashamed of itself. More stories are character driven.
Some genres evolve strong subgenres that did not really stand alone before. I am thinking of urban fantasy (e.g. The War for the Oaks or The Hollows series) and cyberpunk SF (e.g. Neuromancer or Snow Crash).
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