Compare results from different constituency sizes
These four election and poll trackers show results in first-past-the-post and party list PR with different sizes of multi-member constituencies. "Region (Proportional Representation)" is the most proportional, or reflective of the number of raw votes cast by the public so it is a useful benchmark on which to compare the other systems.
Observe how in FPTP two major flaws when there is a greater-than-two party system: (1) the party with the largest vote share compared to all other parties, no matter how small, takes a huge number of seats in comparison; and (2) how small shifts in vote share and rank order vastly shifts the seat distribution in a non-proportional way. In comparison, the other constituency sizes in PR more accurately reflect the vote distribution.