Possibly - but hard to say at this point. I have a few interesting ideas for this speaker and once we have the prototype cabinets on hand I will be able to provide more feedback as to how this speaker compares to the Sierra-2. Without any question, the Sierra-2 will have deeper bass so if you are not using a subwoofer, the S2 as the center is the better choice...
Overall goal with this speaker, much like the Luna is true high end performance in a very small compact cabinet. In addition, this speaker will be incredible as an on-wall speaker!