Anyone find a solution to this issue?
I'm having the exact same problem: Connecting the rMBP w/Mountain Lion to an external Dell U2410 set to it's native resolution of 1920x1200 with HDMI. Everything, especially text *but* also graphics (photos, close/minimize/maximize buttons, etc.), looks very fuzzy and not sharp. Hooking the same monitor to a Windows 7 PC gives excellent picture (used it for 1 year before switching to the new rMBP).
I've the same issue.
Dell 24" U2410 external monitor, 1920x1200, connected by DisplayPort
MBA 13" 2011, 10.8 ML
MBP Retina, 10.8 ML
MBA to Dell is good, text/graphics is as should be, nice and clear.
rMBP to Dell is blurry with washed-out colours.
I've just installed 10.8.1 and will retry when I get back home.
UPDATE: Nope, 10.8.1 behaves the same.
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