I don't know if I can claim anything general, but take from my experience what you will:
I got rejected at U of T even though I have completed a masters at McGill (3.83 GPA) and am currently completing a second masters at UChicago (3.9 GPA so far)
Only other school that I applied to was McGill, where I also got rejected
Undergrad CGPA: 3.41
No significant extracurriculars
All Ontario law schools will just consider a Masters degree as an extra curricular activity.
The University of Alberta law school will certainly take Masters grades into account when the law school assesses applicants' grades.