Its 4k, so its clean but at the end of the day fallout 4's art style and old engine isn't going to be able to output amazing graphics in this day and age - if this was 2010 then yeah maybe it would be considered "good"
Has it actually been confirmed that textures are 4k? The announcement said nothing of the sort.
The game is running much cleaner, textures quality is much improved and fog/smoke/rays look better. Draw distance was increased quite a lot which is nice, framerate is still 30 but it does feel more stable like its no longer dropping