Trav'ling Canuck
Deity
- Joined
- Feb 7, 2018
- Messages
- 3,477
As far as we can tell, no, but that's complicated by the fact that part of Civ IV's life cycle took place pre-Steam, and the majority of its dedicated players likely bought in early and continued playing offline or on other servers in a way that can't be tracked. Not only does that mean the data isn't fully available for Civ IV's playerbase, the exposure Steam gives to games that debut on the platform was simply better advertising than Civ IV ever received. So Civ V was likely to have sold better even early purely because of differences in marketing.
So basically all we have to go on is imperfect Steam stats, which are somewhat more reliable but not that much less anecdotal than the testimony of the 1-200 people who post on CivFanatics.
I think we can safely say that some people love Civ 4 and think it's the best game in the series. Some love Civ 5 and think it's the best game in the series. Some love Civ 6 and think it's the best game in the series.
I'm not sure much else is relevant. Three different games, appealing in different ways, and to different degrees, to different people. They all have their good points. They all have their flaws. And they all have features that some people view as good points and others view as flaws.

EDIT: My point being that parsing usage statistics isn't particularly meaningful, anyway.