Direct language points
CLB 8 (all 4 skills) = 92 CRS points. CLB 9 (all 4 skills) = 124 CRS points. That's +32 direct language points for the same upgrade applied across all four modules.
Transferability bonus - the hidden multiplier
At CLB 7–8, a Master's degree earns +25 transferability pts; 3+ years of foreign experience earns +25 pts. At CLB 9+, both double: Master's = +50, foreign exp = +50. The maximum transferability is 100 pts. One CELPIP improvement from CLB 8 to CLB 9 can add up to +50 extra transferability points on top of the +32 direct points.
Total realistic CRS gain
For a candidate with a Master's degree and 3+ years of foreign experience, going from CLB 8 to CLB 9 can add +32 (language) + 50 (transferability gain, from 50 to 100 capped) = up to +82 CRS points. The transferability cap is 100 total, so the actual gain depends on your existing transferability.