Trends from the listings this site scrapes (weekly, by neighborhood) and from Quebec Land Register filings (monthly, Greater Montreal). Evidence only — read it your way.
Neighborhoods
Greater Montreal sales volume
Acte de vente filings per month by price band — Quebec Land Register, admin regions 06/13/14/15/16 (≈ Greater Montreal). All property types, not just condos.
Sales by region
Acte de vente filings per month, per Greater Montreal admin region — Quebec Land Register. All property types, not just condos.