My current tally, according to Steam, is..
Civ 5 = 229 hours
Civ 6 = 278 hours
Now the caveat to that is that I obviously owned Civ 5 for a lot longer than I've owned Civ 6. So far, Civ 6 - despite not feeling like its clicked with me as much as Civ 5 , has in fact turned out to be played more. I never ever play solo on Civ though, I always only play multiplayer on giant marathon maps. I'm really looking forward to the expansion, the return of governors, individual city loyalties and 8 new civs is pretty good content for an expansion imo.
(something really nuts, is that my missus steam says that her tally so far for Civ 6 is 770 hours
)