They're still using the blurry Enterprise shot when at warp, at least early on in the season. I skipped ahead to The First Duty to check out the SD footage. The CGI model was used at the beginning of that episode, and not the blurry model. Did they not finish the improved CGI model until midway through the season?
They did a GREAT job blending in the SD footage. I had to go back and look at some of it because I did not notice at first. Honestly, I've seen some film footage throughout this show that looked worse than that.
The SD footage in Power Play is OK. Not quite blink-and-you-miss-it, but it's not very obtrusive. Much better than the previous SD cameos, like in We'll Always Have Paris.