Godot Super Scaling : 1.1.0 Update
The 1.1.0 update adds multi-pass rendering, which separates the upscaling from the super sampling, resulting in a much more clear image. This eliminates the need for a smoothing parameter, and the default sampling parameters have been tweaked to give good results at all render scales. The quality has improved across the board, but most noticeably better at lower scales, such as going from 540p to 1080p.