I actually think Australia is the most clear cut one because until they were not on the same strategy he was running away quite clearly (even if a bit of it was down to Leclerc making a mistake), something that wasnt the case in any other race.
The pace difference was not very huge in China until Ferrari decided to screw Leclerc over. In Spain we only can compare the final stint to where Vettel was a bit quicker, but it's also a stage of the race where drivers often dont push anymore unless they have a chance. In Baku Leclerc was running an entirely different strategy, so the only possible comparison is over cross comparing them with the Red Bull guys (Vettel was more or less as quick as Max, while Leclerc struggled to keep up with Gasly), which might not tell the whole story either given that it could be that the Ferrari might just react to a heavy car on mediums differently.
I would also say that Vettel was in the race quicker 4 out of 5 times, however it wasnt very clear cut IMO. Nowhere near as much as Bahrain anyways.
Actually agree about Spain, Australia, Bahrain
In China Leclerc was cork in the bottle, in second stint they had same tires, lenght 15 laps (laps 16-18 Leclerc was used to slow Mercedes, which didnt work) in free air and Vettel had same overall time with a car which was 0,4sec. heavier/slower.
In Baku Vettels medium tires were 11 laps younger but he was miles faster to explain that difference.