Well, I can confirm now that with the latest build I tried (0.9.1-997-gf061288 as for the moment) and buffered rendering enabled along other things like mipmapping, texture filtering set to linear, while scaling to x2 (xBRZ) the game looks outstanding, all those issues are gone (keep in mind that I'm using a nvidia gpu though), here some screenshots as proof:
ren 2-1
ren 2-2
(link due to img size)
ren 2-1
ren 2-2
(link due to img size)
Since English is not my first language sorry for some misspelling on my posts