So lets talk about qualifying:
MS
Great to see that he finally has the measure of his team-mate. Lets wait and see how he does during the race, because it was getting painful to see him so consistently getting beat by Rosberg.
RedBulls
On a dry track, I can't remember the last time I saw 1 team so far ahead of the rest of the field. It would be interesting if someone could dig this statistic up. I remember in 1992 Silverstone when Mansell was about 3s clear of the next non-Williams. Perhaps in 2004, Ferrari may have such a gap?
I think McLaren and Ferrari have to hope that the RedBulls have reliability problems or end up taking eachother out. Thius season could be very tough if this sort of gap is maintained. 1s/lap is MASSIVE.
McLarens
Best of the rest. Enough said. Hamilton outqualifying Button - on a dry track, with no extraordinary events, this comes as no suprise. Button really must try and hang on tomorrow, otherwise the Redbulls will have a race of their own, Hamilton will have a race of his own, while Button could be battling with Alonso/MS (3 world champions together).
To be honest, I think if its dry tomorrow, it could be a very boring race, (unless of course Hamilton manages to get himself at the back, in which case expect lots of overtakes). Spain really needs some rain or an artifical track watering system during F1 races.