The difference in performance is quite larger than what it was 3-4 races ago. Mercedes is getting the upper hand more and more each race...
In quali, yes. In the race, no.
Let's look at Vettel's races after the first few races:
Russia - finished 6 tenths behind Bottas
Spain - finished 3.5 seconds behind Hamilton with bad VSC luck
Monaco - won
Canada - pace outlier just like Mercedes had in Monaco
Azerbaidjan - was able to follow Hamilton the entire time until road rage happened and managed to hold him back afterwards (despite the huge quali gap)
Austria - finished 6 tenths behind Bottas
Basically, the situation is still very similar as in the first few races, in the end track position and setup variability matter and Mercedes is generally faster in qualifying.
Now they might REALLY have a problem if Red Bull becomes a serious kingmaker threat after the summer break, but right now it's mostly "FERRARI CAN'T DEVELOP A CAR" confirmation bias.
And I say that as someone who's quite pessimistic about Ferrari's title chances.