ROUGE
Pitch Width Seating details
Premium Rouge 37 18.5, 18 recliner seats
Rouge Plus 35 18, 14 standard seats
Economy 30 17.5, 232 standard seats
ICELANDAIR
Pitch Width Seating details
Saga 40 20.5,
22 recliner seats
Econ Comfort 33 19,
65 standard seats
Economy 32 17.2, 129 standard seats
FI offer considerably more seats in comfort class as a % of total seats and pitch and width offer better passenger comfort over all. I must say I had a chuckle when I noticed AC list "actual width" and "width with the armrests (outer width) useful information if your girth is large enough you have to sit ON the armrests because you can't get tour tush ON the actual seat...
http://www.seatguru.com/airlines/Air_Canada/Air_Canada_Rouge_Boeing_767-300ER_new.php
https://www.aircanada.com/en/about/fleet/b767-300rouge.html
http://www.seatguru.com/airlines/Icelandair/Icelandair_Boeing_757-300.php
There are other benefits in choosing FI - at the top of these for "extended" families is no charge for a 2nd checked bag and likelihood of fast flights to YEG from Europe from the Euro cities that FI serve that are HUBS. Example: FRA, LHR, AMS, CDG. If arriving from India or anywhere in Arica for example into any of these HUBS on other than a legacy carrier - flying FI to YEG will be faster, more comfortable and less costly than using Air Canada.