D4K/D4V2 + Lume X1 + NTG35, Sustained Output/Runtime?

I'm having a hard time finding good reviews for these lights where they show the peak sustained lumen and the runtime for those. The problem is that basically all reviews are years old and made for the basic Linear+FET driver. For instance there's one from TacGrizzly where the D4K apparently can't sustain more than 250lm, which seems like a driver bug for a 21700 light. I'm only really interested in the new Boost driver version of these lights and I'd be curious if there's much of a difference in sustained output between the D4K and D4V2, given that the size difference is quite small. Thanks!