There are a couple of errors you have to consider.
1) Statistical errors. On a one lap qualifying lap how consistent can each driver be. Some made big errors and these are noticed. Some small (a couple of tenths?) that weren't noticed.
2) Systematic. How different was the track for each driver between Friday and Saturday? The trac will be different on both days (surface/weather/etc...). Also som went out near the end on Saturday and near the begining on Friday.
3) Another systematic. They have had more practice time since Q1. So the cars should all be set-up better.
Thro all that into the pot and it is very difficult to know what is going on.
But those comparisons are the only thing we have to give us an idea of what qualifying represents.
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