You can compare crisp shots with out of focus shots and more DR with less DR.
In order to judge better the image quality of a sensor, you need to use it with the best glass you can, and guess what... most of the top lenses are all manual focus: the Zeiss 135, the 2 Otus ones, Voigtlander 125, Coastal Optics 60, Leica Apo 280, 180, 100, and others.
That's why I don't see the 7D II AF as a major improvement, but just as a "better than normal 2014 AF system". It would have been imbarassing if it was not improved.
Anyway, most of this assumptions are quite personal and based on personal experience and opinions.
I think that's the point, here: which aspect of a camera system is most important depends on how you use the system. If you do only one type of photography, e.g. landscape, that's limited by low-ISO IQ, then you should choose your system for that. If you're a sports photographer, then AF and lens selection may be more important. Those, such as myself, who dabble in a variety of subjects need to choose a system that balances our needs and budget. The entire question of which is the best sensor, though not meaningless, can't really be addressed without discussing the way the camera will be used.