I would think Sonar would be way up there with Cubase and Logic (excluding Pro Tools for now).  However I find when I call tech support for almost any product trying to work with Sonar, I get the "I am not familiar with the Sonar routing..." or similar answer. I got this response from UA and Dangerous Music over the last few weeks as I was trying to optimize my D-Box Apollo combo and had an issue (what turned out to be stupid on my behalf).
 
If Sonar is indeed in a respectable position, Gibson needs to reach out to the various DAW support plugins and external hardware. If Sonar is not in a respectable position, Gibson should try to rectify that somehow.  
 
 

Market share data will be hard to come by. I do see plugin websites routinely list Sonar as one of the DAWs used to test compatibility though. For whatever reason, Pro Tools continues to be the baseline DAW in most pro studios despite its shortcomings and clunky interface. There was a Pro Tools article a few months ago in Sound On Sound about the user's top ten wish list. Sonar had all of those features deployed already!

We already had people in the house who were astonished because SONAR could do more then ProTools and Logic. And they also telled us, that the Apple computer is also crashing down once a day.
We have 800 clients per year. Some clients are also commercially working with Magix Samplitude Pro X3. And Samplitude Pro is very rare listed. And Cubase has in germany the image of amateur recording.
 
 
 

Most DAW vendors other than Apple and Avid are privately-held companies and therefore not required to release such information, and they don't. Even the companies that are required to make numbers public don't reveal the size of their install base, only the dollar amounts of their revenue. For Apple and Avid, DAW sales are a tiny sliver of their income that might warrant a single line item on their annual reports. Avid, for example, just says that DAW and workstation sales account for about $72 million a year.
 
Of course, online polls exist, but they're pretty useless. 

3...2...1...

Cakewalk has worked with a few high market company's like Overloud, Melodyne, VocAlign.
I think something that is overlooked is the work it has done with Microsoft and we are seeing the trickle down effect in new features such as WASAPI, pen, exc support.

Not sure if this is relevant but Image LIne claims that FL Studio gets 30,000 downloads per day.  
That's eleven million downloads per year! I suppose most are demos?

In german recording studios you are laughed when you use a computer with Windows. They say only with a MAC you can make professional music. Windows is only for amateuer (they say!)
This is because Apple had the first computers and they came at first into the recording studios. So a lot of german recording studios use MAC. They don't use SONAR because it doesnt run with OSX.
 

I often get "you don't use Apple?"  Musicians, visual artists, writers etc.  I'll often reply, "I don't want to pay double for Apple on a PC."  The simple fact is most music professionals use Apple hardware, and Avid is just about exclusively Mac.
 
If 70-80% of your customer base is on one OS, most of the support will be biased to supporting that OS.  And therefore the most convenient answer to those not using a Mac is to get one.
 
In many ways Fruity Loops and Cake are in the same situation.  FL Studio, going way back, was the most numerous DAW around since every kid in the world w/ a pc downloaded it for free or cheap (one famous story that isn't apocryphal is FLS releasing an update that locked your data on a hack; there were people all over the website asking why they couldn't access their songs ;-)  SONAR is probably still the most popular DAW for people with who had a PC (when those were expensive) who also play guitar, or tuba and want to get into recording their instrument of choice w/o overpaying for a superfluous Apple computer.  Which is why Cake needs to jump into the IOS market and grab share from there.  If you get familiar w/ the Cake name for your IOS fun, you are more likely to get SONAR for your PC.  And in a couple of years tablets will be fast enough to do your music work, and most of the market will be there, not on a laptap.

AT
... and Avid is just about exclusively Mac.

ProTools is Mac AND Windows. 

Cakewalk had a problem to translate their Windows code to OSX. I think Avid writes their code first in OSX and translate it to Windows. Cakewalk should rewrite the full code in OSX, but this takes a lot of years.