I have a very wide foot with a rather big arch.
The combination of the laces system, with a kind of small pillow under the arch of the toes makes that I can have the shoes extremely tight without being painful. I am usually 41 in normal shoes and uses 38.5. Over all sportiva model (I think I tried almost all of them) these are by far my favourite. Many seems not satisfied with the hill, but to me these are by far my best shoes for hill-hooking. The reason, is that when using for example, Solution model, you have so much rubber that you do not feel it. Katana or muira have a hill that is too much align unlike the testarossa which is a bit bulky. I also appreciate that they are made of leather as synthetic material tend to smell bad with time. Overall, I have been trying for more that 10 year all different type of shoes, and always thought that my testarossa were way better. When I need to complete a project I was using my worn out pair of testarossa rather that my brand new katana laces. Now I have stop trying other model as I always got disappointed.