I love the chart, it's very revealing and explains why the majority of famous pianists are/were men.
I always knew my hands were large for a woman, but I've just measured them and found that I have a span of 9 inches - it's official, I have "pianist's hands"!!! This delights me, as it seems like some compensation for the fact that I can never buy nice women's gloves because they are always too small, so I have to be content with buying men's gloves.
The keyboard looked interesting and is something that I might be tempted to consider upgrading to in the future, if my DP breaks down or becomes unreliable one day, but not at that price - it is astronomical! Maybe in time the price will come down, but in the meantime there are some other keyboards around with narrower keys, and probably some second hand upright pianos with slightly smaller keys too, so these might be useful for keen pianists who struggle with standard width keys. Anyway, my fingers are not slender, so I might find the 5.5 octave keyboard slightly too narrow for my hands.