The 2700k is not necessarily a higher binned chip than the 2600k. Also many 1090t's clocked higher than 1100t's because they werent necessarily higher binned either.
Although you may be correct about the 2700k/2600k, I disagree about the 1090T/1100T - 1100T users can hit 4.2, 1090T users were lucky to get above 4Ghz
Theres a thread on XS where they are discussing the i2700k - looks like it clocks the same (slightly higher multiplier wall) but uses slightly less volts



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