Last night, I took out the Hank D4K, and two formidable competitors, Convoy M21B w/ Nichia B35AM 4500k and Firefly E07X w/ FFL351A 4000k Rosy, for my evening walk. I consider real life use the final arbitrator of a light’s worth, nearly regardless of specs. From the standpoint of tint, for my taste, these 3 lights are THE giants in my small light collection. They are for me, together with the reference stadard 219b 4500k in Convoy S21D, the “best” of all the lights that I’ve cherry picked based solely on great color rendering.
And the WINNER is… none. I could not pick one LOL. It’s remarkable that 3 lights with such different specs and designs could be loved equally. 
Not too surprising perhaps, they ARE my top lights.
Hank-Emisar D4K w/ 519a 5700k DD:
Driver: Lume X1 (this is the $12 Boost option on the Hank website)
Output: 2000 lm
Throw ANSI (30 sec): 218 m (longest throw among my quad Nichia lights)
CCT: 4100k
Fireflylite E07X with FFL351A 4000k:
Driver: Lume 1
Output: 4330 lm
Throw: 269m
CCT: 3900k
Convoy M21B with Nichia B35AM 4500k
Output: 1090 lm
Throw: 263m
CCT: 4300k