I don't think this will be one-sided; i.e Räikkönen demolishing Grosjean. I think Räikkönen will come out on top, pretty sure about that, but Grosjean will always be fairly close and sometimes able to beat him.
So, third option for me.
...looking forward to read posts from Alonso-fanboys using the margin between the two, Räikkönen & Grosjean, to puff Alonso's chest. That is if it's closer between these two, than it was with Alonso & Grosjean.
I did a quick bith of maths, Grosjean did 7 races last time, it rained in one Qually, and he had a car problem in another, for the other 5 races he averaged 0.43 behind Alonso.
This season Massa's averaged 0.29 behind Alonso.
Make of that what you will
For the record, I think he will be really close, quicker at some tracks, slightly slower at most, call it 12-7 in Qually, and score 60-80% of Kimi's points.
I also did some quick maths, Fisi was behind
Kimi about 1 second average in qualifying without Brazil, there must've been some mechanical problem for Fisi but too lazy to check out. If we take Brazil into count, average is around 4 seconds. That's massive, especially if you compare to Fisi vs. Alonso qualifying average. What does that tell you, i ask? Yeah, absolutely nothing...
On topic, gonna be close with
Romain maybe on top in the beginning. But I suspect
Kimi come out on top, not with a huge a margin but still comfortably. Then again, could be that he's lost it. I mean, if you're performing on 97 % level, not good enough.