I've mentioned before that the Brenizer Method -- like any large panorama technique -- will compress noise away at a given print or display size, similarly to how a something shot at ASA 800 on large format will print with less grain than a 35mm shot.
And I wasn't kidding. The sun goes down FAST over the mountains in Chile, and so just a few minutes after sunset is was already incredibly dark, and even at f/1.4 I had to shoot this at ISO 51,200! One part D4 magic, five parts panorama compression.
(Of course you can learn more about this with nearly three hours worth of instructional video here: http://brenizermethod.vhx.tv/ )