yeah, high ISO desaturation is a cool look sometimes. When I'm shooting street while just walking, i usually shoot at 1600, so that I don't have to worry about blurry pictures (a little noise in street is sometimes actually a good thing, and I usually make street B+W anyway). But there have definitely been a few I left in color because I liked the high ISO desaturation look. It's such a mild effect it's kind of hard to mimic in post.