For some reason the graphics quality got worse from beta 5 to beta 6 (resolution setting matches monitor, quality setting is “Fantastic”, playing on Linux).
Previously everything was sharp and clear, now things are visibly blurry. On closeup, the squares show a strange gray border like anti-aliasing has gone wrong. Furthermore, the + passengers looks clumsy (possibly for the same reason) and the pie-shaped station seems to be distorted (while the circles are perfect circular).
(Unfortunatly I already dumped the beta 5 binary and cannot provide a screenshot for comparison.)