Going with facts (Samples, data, algorithms used ...etc), about 85% identical in the Sound generation.
The Midjay Pro is a good bang for the buck as it was derived from elements of the Audya series and priced more 'comfortably', but it does have some edge in it's voice articulation - especially in the Brass and woodwinds!
Over all, the AUDYA is still the flagship.
Overhere in europe the price difference between them isnīt that huge... 2000 for the Midjay Pro and 2400 for the Audya 4...
So i guess there is no reason to choose the Midjay Pro if you are willing to push a few bucks extra, unless, you really need a more compact unit..
Thanks AJ for the answer...