I have seen his Horizons stuff, one about the nature of time the other about the attempts at nuclear fusion. Prof. Cox has stated before that Sagan is one of his role models.
Anyways, Sagan wrote the book on how to do a good show on 'everything' coupled with great visuals and a great narrative hosted by an enthusiastic telegenic scientist.
Cox's version of this is amping up the AV side ; The music and CG are really very well done and he speaks with such breathless wonderment, like a little kid explaining what he learned to his mum that there's
even a parody of it.
I thought the shot of him on a peak in the Wonders of the Universe was a bit absurd. And it was shown in the intro sequence to the series, guaranteeing that no one would miss it.
He later apologized for his vanity