A long time between comments but I thought Id put my two cents worth in. Personally I believe that 2K4 looks better than UT3 anyway. I understand that the UT3 enginge is capable of some incredible things but really I think the 2k4 maps look more like the UNREAL space theme universe it should be. UT3 is too dark and grainy. Port it into UDK and things might be different.
Unreal was always dark, rusty, industrial and gothic... and yup, UT3 overdid it. It's as if you would take Unreal 1 and make it 2x darker. *rolls eyes*