All this talk of "DAW x has inferior MIDI editing to Sonar's" needs to be taken with a pinch of salt IMO. I'm not suggesting that people are lying when they say it, it's just that even if you're a heavy MIDI user, DAW x's MIDI editing might be just as good for your purposes as Sonar's.
For instance, I use MIDI a LOT. All of my projects are centered around VSTi's, and I do a lot of guitar-MIDI conversion, and I do stupid amounts of fine tuned editing in the PRV. Hours upon hours of it. I have MIDI flying around my projects like there's no tomorrow. Both my MIDI and MIDI generated by plugins. Despite that, I don't think I use Sonar's MIDI capabilities to anywhere near their full extent. As an example, in 5 years of Sonar use, I've never once used the event list! Even just tinkering with stuff in the piano roll, I don't use half of the tools available to me.
It's been awhile since I used Pro Tools, but I don't remember having any problem editing MIDI in it, and this was over 5 years ago. I'm sure the MIDI in Studio One, Bitwig and whatever other DAW's would be fine for me as well. So just if you're a heavy MIDI user who is being swayed by people saying that such and such a DAW has inferior MIDI editing to Sonar's, don't write it off. Have a think about what you actually do with MIDI on a daily basis, and look into how those operations are carried out in the new DAW. You may find it just fine for your needs.