Listen, I have no idea how to pronounce his names (either of them). But what I've seen of him, he's a pretty solid actor. I would say he's also something of a chameleon, but honestly that might just be me and my "not paying a lot of attention" thing. So he may or may not be something of a chameleon (and if he is, that's a good thing).
His 2005 movie Kinky Boots is one of those warm wacky British indie comedies (like The Full Monty). It's about a failing shoemaker that changes from making men's dress shoes to making fetish footwear, and is based on a true story. Ejiofor plays Lola, the drag queen we all wish we could be.
And Lola explains the difference between a drag queen and a transvestite for us: "A drag queen puts on a frock, looks like Kylie. A transvestite puts on a frock, looks like... Boris Yeltsin in lipstick. There, I said it."
If my likening it to The Full Monty gives you pause, Kinky Boots has nice layers of camp and cynicism to help you get through.
And this from his Wikipedia entry makes me happy: Ejiofor is considered one of the leading candidates to play T'Challa in the proposed Black Panther movie based on the Marvel comic books character.
Happy birthday dude! Rock on!