I have a set of Sceptre 8s, and one of the things that impresses me about them is how even the bass response is, and how well the work I'm doing on them translates to other systems. I've only had the CMS50 here, so I can't comment about how well the 65s compare.
The Sceptres are coax, so imaging is one of the things at which they excel, and they're likely to be more accurate than conventional two-way designs in that respect.
You should try them in your space of course, though. If there's no local retailer, there are certainly dealers that will let you return them for full $ back if you don't love them.
If you're looking for coaxial drivers have a look at Equator Audio.
I haven't had a chance to work with Equator's Q series, but I do have a set of Pelonis Model 42, which use a dual concentric coax driver like the D5 and D8.
The Model 42s do image really well, but Fulcrum Acoustic's implementation of a horn loaded compression driver in the Sceptre's design scheme gives me more of what I'm looking for in the mids - more open and 3D sounding.
Ciao Troys and Rosemeister, after months have you bought sceptre s8 ? I am focal cms65 user too and i want to buy sceptre but i'm a bit confused about s6 or s8..i think i would go to 8..i'm very happy with focal but if i can improve my mix & master with sceptre....let's go with sceptre :D