My personal opinion is that I am happy to have a new box that I can put in my pocket at any time and take with me and connect anywhere. But this one can completely keep up with the others in terms of performance.
It all depends on usage. If you want something more stationary, the Z11 is always the first choice. If you want something new that you can take with you quickly, then the Z mini is ideal.
It's all a question of use.
As you say,for the time being i will stick to my Z11PM for the moment,esp because of the fact that the interesting feature of QMS will not work on my TV set (only late versions of e.g LG tv enable this function)
Another drawback of the z mini i find the lack of recording possibilities,without additional USB connectors.
Nevertheless,never say never,as i am impressed by the technological innovations of the z mini,and when i am going to buy a new tv that enables QMS,i will certainly reconsider buying a z mini