This topic is like the never-ending story...
I believe it's fair to say that what the SV folks want is something on par with other major DAWs such as Cubase, Logic or DP. And something tells me that none of those are on par with standalone Sibelius (probably not Finale either). But that's not what is being requested.
Disclaimer: I've never used Cubase, Logic or DP. But I've read these threads often enough to know that *they* are the common benchmark for comparison to SONAR's SV, not dedicated scoring software like Sibelius.
PS: DJ... no boycotts here either. In fact, the idea of boycotting a software package just seems really weird to me, not to mention a futile exercise in the overall scheme of things. Boycott schmoycott.