I carried a G43 in the pocket (DeSantis Nemesis in 5.11 tactical pants) for a week.
Didn't work.
It fit fine, as does my G26. Carry is no problem at all with either.
The problem is drawing the pistol. For me, even in those very generous pockets, I just couldn't get a smooth, clean, reliable draw.
The G43 is just slightly taller (top of rear sight to bottom of magazine) than the G26. That measurement is the important one in pocket carry. That measurement is the one that determines how the gun will come out of the pocket. Thinner is fine, lighter is good, but you need "shorter" top to bottom in order to speed a pocket draw.
I love Glock, but J frames draw smooth as frog fur, and remain my preference for the pocket.