That makes sense in the studio. It rarely makes sense for me in the field which just doesn't seem to be that bright. Shooting in bright sun is rare - overhead lighting is not usually good anyway, when the sun is high. And there are always ND filters. Considering the difference in speed is, as folks pointed out, 1-1/3 stops that's just not a huge difference. It's not like Portra 400 versus the old Ektar 25, say.
Originally Posted by TheFlyingCamera