I'm 6'4 and when looking for my Stilo I found the perfect car - the only problem was the sky roof. The test drive was so uncomfortable! Even with the seat down to the floor my head was rubbing the roof - it really does make a huge difference to the headroom. My car (no roof obviously!) has plenty of headroom, I can have the seat height anywhere I want with no problems.
Don't get me wrong, I would have loved to have the sky window, but as far I'm concerned it's not a realistic option on the 3dr if you're tall. The 5dr is a taller car, so I'd imagine it's a lot better headroom-wise.