Tiny anti aliasing issues with Real-time renderer

I am having tiny aliasing issues with this asset:

See, the poster´s edges are flickering:

The Real-time AA Sharpness settings did not made any difference, I think default value 0.5 was the best.

rendering to 3000 pix width and then downscaling in premiere made it a bit better… I would not call this a solution anyhow :P