My Wife arrived through Turkish Airline departure Islamabad ---> Istanbul ---> Toronto
In Pakistan no question asked they just looked at the paper work (COPR and Visa), no question asked at Istanbul Airport either.
When she arrived at Pearson Toronto there are 2 ways one for Permanent residents and the other for All others. There she took the all others pathway (since in the PR path they have automated machines which scans PR Card and Declaration form and after that your are done) while on the other path an officer looks at your paper work confirms your details i.e. Name spelling, DOB, Address, Dependants, Currency you are bringing etc. and if all is good signs one copy of COPR and hands it over to you. keep the copy safe its very important. (even if you loose ur PR Card or it gets stolen you need this copy of COPR to get a new one).
Welcome to Canada.
Collect your baggage and meet your family who is waiting anxiously outside.