Out of curiosity, I put my 6700K at 2.2GHz without any Speed Step or turbo active. In other words, it's locked at 2.2GHz. Memory is 16GB DDR4 @ 2667MHz 15-15-15-36-1T. My Windows 10 installation is clean and I made sure there were no appliactions running in the background while Geekbench ran. Here's the comparison to the iPad:
http://browser.primatelabs.com/geekbench3/compare/4149721?baseline=4183457
If we assume that the iPad actually runs at 2.16GHz (and no higher), the performance/IPC advantage of Apples core is pretty big in some cases. Many of the test results seem to hover in the +30% area. That's if the results are actually meaningful at all. We can speculate, but I don't see any way of determining who's right with any certainty without having much more varied test results available.
For completeness, here's the bone stock Geekbench score of the system with otherwise exactly the same running conditions. Multicore enhancement disabled.
http://browser.primatelabs.com/geekbench3/4183670