In the grand scheme of things, I don't think the 7D II will live up to many peoples prior expectations that it would be a "5D III high ISO killer"...simply isn't going to happen.
In the grander scheme of things that was never a realistic expectation though.
True, but a lot of people had hopes that would be the case. Just saying, the preliminaries are pretty much crushing that hope. It's better than the 7D (as it damn well should be!), but nothing exceptionally good...its a small evolutionary improvement over the 70D.
It would be reasonable to expect the sensor to approach the 5DMkIII's in iso performance, but it clearly does not. Happily so, because it means I won't fall into the 7D 'digital teleconverter' trap twice and rather save up for some serious long glass.
As for crop sensors, Sony has served me fine. In fact the NEX-6 that I previously owned already easily had the 7D beat on sensor performance. The a6000 very nearly matches the NEX-6 high iso performance despite the significant increase in pixel density.