Will a full sheet turn a tight corner?

I continue work on the household network, installing junction boxes and running conduit.

I also purchase a couple 4′ x 8′ sheets of drywall ($13.68) as a test to see if they can fit down the staircase and turn a tight corner into the lower level. The sheets make the turn, but just barely. The stairwell walls will need new paint.

A couple sheets of drywall were purchased and carried into the basement with a carrying handle to see if they would turn a tight corner at the bottom of the staircase.