You could tell he was locked into Sabonis on that play and just waiting to pounce when the shot went up. Part of the difference in CK's recent play is that he is getting much better at anticipating where the ball will come out of a shooter's hand and high-pointing it instead of chopping down on the guy's arms so much. The downward chop was one of the reasons he got called for so many fouls earlier in the year.
Still lots to work on but he's coming along nicely.