Beef Sirloin Roast Steak

I saw a beef sirloin "roast" in the store that was cut like a large thick steak.  I figured since it was sirloin, it would be tender enough to pan sear and have as a good steak.  This was a good guess.  It came out really good.  I was surprised by how good the flavor was.  I'm not sure what the key factor was, but I'll pay attention next time I try this.