Price Advice Sell iMac and MacBook Air for MacBook Pro?

I am a professional video editor.
I currently have iMac 27" mid 2011 with 20gb RAM, 1TB HDD 2.7GHz i5 - For editing.
I also have MacBook Air 13.3" early 2014 with 4gb RAM, 128gb flash 1.4GHz i5 - For daily use and school.

Maybe I should sell them both and buy a MacBook Pro, it will be better for editing since it's newer, it's i7, flash and I can edit on the go.
Of course 15" are not enough, so I'll buy a screen too.
The MacBook Pro will be used for editing and also for school because it's a laptop, but also strong.
I don't care about 256gb vs. 1TB because I have 4tb external drive and 2tb portable external drive.

So is it worth it? should I sell them to buy the newest MacBook Pro considering the benefits I said and also the new "Metal" for OS X?

Thank you!

 

edit on the go is just a little bonus, I am searching for something better for editing that will fit to my editing needs and to my school needs.
Will the MacBook Pro will be better than the current iMac?