If you have a choice between an idiom and an uncommon construct that will require a comment, go for the idiom. Reading code is a lot more difficult than reading English, and takes a different kind of brainpower. Switching back and forth between the two takes cycles.
I can skim well-formatted and idiomatic code and get the gist of things. If I haven't written it, sometimes I can even pick out bugs that way. If there's no real need to use something different, you're adding maintenance costs for no real gain. Yeah, comments help, but they have a way of being ignored and of becoming obsolete very quickly.