I know no one's been here in a while...
... but I use Sonar 5 and Pro Tools. I can track in either environment and if you save my Sonar files as OMFI, I can take them complete to any ProTools studio and use it. I think that any producer/engineer worth the title will use the tool that he likes best and acquire the knowledge to integrate it into the industry standard.
If you can afford Pro Tools TDM, (at about $6,000 minimum) you get 32 max tracks, no VST or DXI plugin support, (out of the box) and you still need to buy a computer! My Sonar 5 producer cost me $599.99, I can use ALL the VST/DX effects, VST/DX instruments that I've accumulated over the years and STILL track my artists vocals in a "real" studio on Pro Tools.
I only have Pro Tools LE for MBOX1 and it works and sounds fine, but I know that my tracks only sound better in the bigger studios because of the hardware not the software. If I paid that much, my stuff BETTER sound that good. I've been in studios that track in Sonar and they sound just as good on that expensive hardware as a Pro Tools LE session from an MBOX...