I have been contemplating over this for a while now. With HDR turned on the sky seems too "dark blue" to me, the sky looks better for me with HDR off (note I am only talking about the sky), more gradient. Same goes for the skyboxi (the horizon object) - it is too dark on the sides that does not have direct sun light and at the same time is too "white-light blue" on the side that receives sun light. Anybody else share this observation?
