I'm using a Macbook Air. If I start Sublime Text with no external displays and then attach the display everything looks fine.
But, if I attach the display first and then start Sublime Text the text is less vivid and sharp on both the external display and the Macbook display.
Left is what the text looks like when I plug in the display after starting Sublime Text. Right is what it looks like when I plug in the display first.
Macbook Air w/ OSX 10.7.2
Sublime Text 2 Beta 2165
Acer 24 inch display model X233HZ