This is the gearing from most teams extracted from onboard shots. I am trying a new visualization this year which hopefully shows the overlap better. The usual caveats apply with data for 1st and 2nd gears being significantly less accurate than the rest.
I am showing the speeds possible in each gear within an "optimal" rpm band arbitrarily chosen to be 104000-12100 rpm. Of course the cars are not limited to that, but they stay there when they can.
Interesting things:
First, there are no very large differences, specially for the highest gears. It doesn't look like any team has a magic bullet or screwed up. To be expected in the third year of this formula.
Haas seems to have copied Ferrari's ratios. The very small differences are likely measurement errors. This is not the case with Mercedes or Renault customer teams.
Most teams chose to have significant overlap in the highest gears and much more separated lower gears. This kind of makes sense since they are grip limited up to 4th, but it seems a bit extreme. You'd think that a bit of flexibility in 4th and 5th would be good to help with traction out of most corners, but clearly not. For 1st, 2nd and 3rd this is likely a non issue as they are grip limited. Actually many teams prefer to stay in 3rd gear for very slow corners, going as low as 5000rpm in 3rd, rather than shifting to 2nd gear. This probably helps protect the tires.
The level of overlap between 6th, 7th and 8th suggests that the 1700rpm range I chose for the graph is already larger than the optimal rpm band (or do I have this backwards?). In fact most teams would shift up before reaching 12000 rpm in most gears, including the highest gears. I don't remember this from years past. Red Bull has an extreme amount of overlap in the highest gears, with the shortest 8th and the longest 6th. While this could suggest a very narrow power band in the Renault engines, the Renault teams has the most spread highest gears, with the longest 8th and the shortest 6th and 5th. Weird. Maybe RedBull is simply too fixated on short gearing from their winning years? They really seem to have compromised the 4th-5th-6h gear sequence to achieve this.
With that exception from Red Bull, Mercedes has the shortest 8th gear, together with Williams and Force India. So maybe there really is very little power advantage left?
Mercedes has by far the longest 1st gear, a lot longer than other teams. This is then almost overlapping with their 2nd gear which is pretty average, so it is only the 1st that is different from the norm. They do launch in 1st gear, so maybe we are in for a whole season of bad starts from Mercedes.
Top speeds: Mercedes has to go to 12104rpm to reach 340km/h and to 12816rpm to reach 360km/h, already way out of the optimum. Ferrari can do the same at 11942rpm and 12645rpm. A tiny bit better for overtaking, but hardly earth shattering differences. If anyone dares to try to reach 370km/h in Monza or Mexico, the worst equipped team is Red Bull which would need to reach 13205rpm, while the best geared team for the task is Renault which needs only 12892rpm.
And big thanks to Juzh for his help.