The fact that some refuted this example does not make it any less valid. Yes, the lighting is different, the source is not at the same place, alright. But it is undeniable that there is a loss of quality between the two versions. Is it due to the lack of dust? Maybe. Light sampling reduced? Maybe. I don't know, I can only observe. Have you been able to find the same depth as in pic 1 anywhere in 1.3?
Sorry, but I cannot see a difference in quality between those two pics. They only look different because in the top picture the rocks are lit from behind (also making the dust stand out) whereas in the lower they are lit from the front.
On a sidenote, I'd go as far as saying it's a bit dishonest to showcase the original training missions as a valid demo for the final game. The first pic was a decisive part of what got me into the game. I'm not saying I would have skipped it if I saw the second instead, but it is certainly not as impressive.
They are exactly the same quality. And there are still high-quality dense rings out there. I'd look at the "Around the Galaxy in 88 days" thread: an explorer log by Maia Posidana. She's got a thing for rings so there are a lot of pictures of them. Some are real eye candy.
Incidentally she also shows an egg-shaped moon in close tidal-locked orbit with its bigger twin. Looks like the Stellar Forge can now generate flattened spheres --that is a new thing.