Lenses are stronger and weaker in an evident fashion, when they are shot in less then perfect conditions.
Give me examples of people in the shots,... not just ants.
Absolutely. More often than not, the differences between lenses can be seen only when you shoot in less than ideal conditions. That's why I don't usually bother with "which lens was this shot taken with" challenges.
Horses for courses.
Yes sir ... Always!
BTW, upon reading your posts regarding the 40mm, I recently tried some panoramas using the pancake and was pleasantly surprised with the results