I found this accidentally, while trying to fix another problem, I turned on anisotropic filtering from the nvidia control panel program settings and noticed huge graphics improvements, without any significant frame rate loss (for 4x with a nvidia 950 ti).
I thought I was already using anisotropic filtering because in the launcher I have this option: --texture-filtering=4 but it turns out it was actually not working.
Now the planes and the scenery look a lot better for me, much closer to how they look in x-plane so I thought that I should share this in case I am not the only one that didn't knew this.
It's like upgrading from a very old version of a program to a brand new one.