Will be seeing movie a second time today, but on my first viewing I noticed quite a bit of practical xenos but with CGI layered on top. I will pay attention to which shots specifically but the only times I saw it as pure CGI was when it was running on all 4 limbs and climbing. Of course, the xenos did a lot of that...
Still, I thought everything looked great and the only time it really jumped out at me (as someone who looks for it, probably not the average viewer) was the neomorph birth when it is just starting to stand up (after it sheds its blood sack membrane junk, that part looked AWESOME), and when the Neo ran up the wall of the temple.