I don't think the original looks better, graphics comprises of a lot of elements and you can't just say it looks bad because the original has volumetric lights and more smoke. It does pretty much everything else worse than Redux from textures to animation, shaders, art work and the assets. The outdoors look very flat comparatively because the lighting does not look very convincing in the outdoor sections, the textures (snow textures for example) in outdoor areas of 2033 were very poor but they are fantastic in Redux.
Also a lot of the volumetric lighting in 2033 simply did not make sense, sometimes you'd see volumetric in an area where it's just not possible. Prime example being the very first location from the game when Hunter arrives and the doors open, there seems to be a light source beyond the door like a sun but what you see is staircases leading up, there's simply no way for sunlight to enter the room in that manner and cause volumetric light and the light's just too damn bright to be any kind of artificial light source.
Also a lot of the volumetric lighting in 2033 simply did not make sense, sometimes you'd see volumetric in an area where it's just not possible. Prime example being the very first location from the game when Hunter arrives and the doors open, there seems to be a light source beyond the door like a sun but what you see is staircases leading up, there's simply no way for sunlight to enter the room in that manner and cause volumetric light and the light's just too damn bright to be any kind of artificial light source.