B&W HTM4S replacement?

Wondering if someone could help...

I have a set of 684s and 685 but i'm looking for good center channel. I'm listen to the HTM61 & HTM62, then I listen to the HTM4s and it won hands down. I was listening to the track 'it never entered my mind' by miles davis and 1:17 in to the track there is a really nice high. On the HTM4s it almost felt painful. The HTM61 and HTM62 couldn't get close.

Now I find that the HTM4S is pretty much impossible to get hold of. The HTM4D is almost twice the price of the HTM4S. Does anyone know what the CM Center 2 sounds like? does it get close (or is it better then) the HTM4s?