It's actually a 2.2 diesel option. As any diesel, it has loads of torque, but still takes nearly 9 sec to hit 62mph. However, the pay-off is that it returns mid to high 40's in mpg. I, personally, would buy one in a heartbeat, but I doubt many US buyers would get in a Q to buy one. The out-going M with the 3.0 diesel (made by Renault) was a much better performer all around.
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The Q50 is actually much better suited for the 2.2 engine as it can return almost 60mpg.
As for the new Q70 diesel, it will likely not sell well even in Europe as other makers in the same range or slightly higher, provide so much more tech and performance. In fact, Infiniti sells about 2 cars per day in the UK, and pretty much none in Gemany. For example, here is a review from the 2011 Jag. It knocks the plums off even the 2016 infiniti.
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https://youtu.be/9q0rGdm1UQI