Hello everyone,
I have tried the Method that was mentioned in this Thread and reinstalled "RDR 2", without downloading the 1.02 Update on the PS4 Pro. It now looks 100+ Times better. I have turned Boost Mode "On", enabled "Supersampling" and have set the Camera follow "Off". I must also say that the "Supersampling" Feature when turned on has an positive effect now and makes the Game look Crispy. The Game looks stunning now.