"Beating" the D15 hasn't really been news for any amount of time now. So many dual stack 140mm heatsinks have come out over the last few years and they all fall in at roughly the same performance. Who wins depends on the test setup and who's testing, and the winning margins can hardly even be called a "win" compared to what water can achieve. Zalman isn't reinventing the wheel here (as much as they would like to portray it as such with their hilarious fans), and I hate clickbait titles.
Zalman used to make some really interesting coolers that were potent for their size, but the fan-in-the-heatsink design has sort of died off over the years. Their new direction of design language is disappointing.
TC14PE, DR4, D15...it's all down to personal preference at that segment of the aircooling market, fan noise notwithstanding.
And most of these benchmarks are pretty much worthless aside from getting a vague idea of where performance is. Testing on an uncluttered test bench or tabletop yields no useful information to when the cooler is put into a restrictive case with stock fans (what the majority of people do), or in the SFF crowd, no case fans at all. Testing with drive cages in the way, testing with the side panel off...you get the idea. Case in point: the U9S and D9L are closely matched, but the U9S easily pulls ahead in highly restrictive environments where airflow is limited or poorly planned.
@kapone32 AFAIK dual stack towers aren't available for TR4. Are you thinking of the U14S TR4? Difference in fan noise probably comes from having only a single A15 compared to the D15, in a much more ideal position compared to the D15S.
This is summer or winter, and humidity is always in the range of 45-50%, and is why I feel more than confident not needing to use a delta to hide other variables. 
