The new version of True Grit, while basically following the same story as in the original (which was based on a novel by Charles Portis) is perhaps a bit darker than the original. And Rooster Cogburn is even scruffier than Wayne's version, as played by Jeff Bridges.
But he, too, is great in the role. I was talking to another couple as we were leaving the theatre and we all agreed that while the stories were pretty much the same the two movies were different and the portrayals of Cogburn were different. But both great performances.
The Coens are fine movie makers. SWMBO thinks they're a little too violent but she loved "Fargo", as did virtually everyone I know. I don't think she saw "No Country For Old Men" but I did and thought it was another great movie.
This kind of rambled. Just go see "True Grit". Either one.