PS5 DualSense controller vs PS4 DualShock 4 controller: 7 massive changes (and 4 things that stayed the same) - Stealth Optional
I think they did an excellent job with this controller ergonomics bcoz with PS4 controller my index finger hovers over the light bar but with this design will actually keep my index
How to Use the DualSense PS5 Controller on PS4 | Attack of the Fanboy
How to connect PS5 controller to PS4 console: Use your DualSense with the PlayStation 4 - Stealth Optional
Can You Use a PS4 Controller on PS5? - Push Square
First comparison between PS4 DualShock and PS5 DualSense controller - GameRevolution