In this he gets to be all kind of awesome, sexy, and smoking. He's supposed to be Italian (which makes things a lot more fun than what Kenneth Branaugh got in Wallander) although he and about 80% of the cast are using English accents. I really wish they'd get a bit more consistent on that front, because the 20% that are actually doing Italian make it a bit strange.
I happen to also adore Alan Cumming as the Masterpiece Mystery host. His intro for the first Zen episode was practically over-the-top camp. Maybe he has a bit of crush on Rufus Sewell as Zen. (Or maybe just on Rufus Sewell...have they been in any movies together?)
Anyway, if anyone is on this particular band-wagon, please let me know.
There's an article and a preview clip here.