Great poll!
Front left pocket, screen facing my leg, lock button pointing towards the ground, all inside of a case for me.
Left front pocket, screen facing inwards, power button down. On anything I wear, this pocket is dedicated 100% to the iPhone, I never put anything else in the pocket to avoid accidents.
Right front pocket, screen facing leg, sleep/wake is pointing towards ground. This provides for the most ergonomic motion when pulling the phone out to use it. My thumb is already on the home button as I pull it out.