My screen almost used to have a grayish hie to it, my girlfriend always commented on it. I just said it was the ambient colour and eye protection but after the beta its so crisp is amazing! So maybe mine was faulty before?
My Mrs always said how cloudy and dull my screen looked with the adaptive display on. I just said it's meant to be like that - so maybe it's not the beta and reinstalling the firmware has sorted it out to how it should be...