*Wall of text*
The reason TBOGT doesn't look as good as videos is, as far as I know the latest patch removes a lot of effects that were in the older patches [at least in GTA IV's case] so the episodes were probably made with these 'fixes' in place that are in the latest 1070 patch for IV.
Also as mentioned above _ALOT_ of other mods come into play to add to the overall effect.
I'm currently using Ultimate Textures, Better Trees and an ENB in GTA IV.
I would take pictures but I'm not at my PC atm.