The Reviewer has only good things to say about the old restoration and even more about the new effort of course which is even better in all aspects in his opinion. He only thing that some viewers will miss the old "red" colour in some shots he says :)
I posted this link but I'm not shure if I can Translate with my bad enlish and i'm not an expert :)
When You say "Vegas" do You speak of this picture?
Blu-Ray
4K:
In German with some Screenshot Comparisons :)
https://blu-ray-rezensionen.net/star-trek-der-film-4k-uhd/
https://blu-ray-rezensionen.net/star-trek-2-der-zorn-des-khan-4k-uhd/