Those are all big speakers for big budgets and rooms. I've heard the Q5 and the Nola in dealer demos. I owned the Eggleston Rosa, and now have the Magico Mini 2. They are three very different approaches to sound reproduction. At this level, you need to hear each with your own music. You'll never get the same equipment behind each, so it will be difficult to really compare them directly and know for sure how they would fare in the same system.
Given my biases, I would buy the Magico without hesitation. IMO, and with my limited experience, of the three, the Q5 is the truest to the source. That is it is the most transparent and neutral when properly set up in a room and with the right amps. The cabinet is silent and it is very coherent. The bass, though not the most extended, to me sounds very natural and accurate. With the right equipment, I have heard them disappear and leave only the music.