PuroMexicano, you are correct, the Q5 is much more "sober" in all respects....and there is just nothing "unique" about the car.
My wife and I drove our loaned Q5 for almost 600 miles over two days and found it to be a very nice road car with plenty of low-end power and good acceleration during mountain climbs using the "manual" shifter to find one of the appropriate eight gears vs. six in the Q3. Also, perhaps because of the gearing, the mileage in the Q5 was as good or better than the Q3 and, of course there was just plain more room for the occupants and all our camping gear in the back.
But.....when we got home and jumped into our old Lexus we were considering trading-in, we realized the Lexus was just the better car to drive, the Lexus ergonomics were better, and there was more room for everyone and everything. And for sure the Q3 is a much more fun experience.....not in spite of its smaller size, but because of it....and it may seem strange, but the positioning and operation of all the buttons and dials needed to operate the MMI is downright dangerously distracting on the Q5 vs. the Q3.
What makes the Q3 distinctive for us, compared to the Q5, is the sportiness, the uniqueness, and the favorable comments we receive from others on how much they enjoy the appearance of the Q3.
The Q5 we drove cost about US $10K more than our Q3.....we (and y'all) got an excellent deal!!