I didn't notice Leia being CGI as much, but Tarkin was fully in uncanny valley. His face texture was a little too smooth and you could contrast with the live actors in several shots. The lighting/shading on his render wasn't right in the bridge, either.
It's weird to me that they would choose a goofy CGI when they could have just taken a similar looking actor. I was getting flashbacks to Tron Legacy the whole time