The steeper it gets the better the small guys are. On a climb like Sestriere you want to be about 68 - 70 kilos like Basso, Armstrong, Savoldelli and have a massive FTP. The smaller guys tend to get beaten on these climbs as although they are a lot lighter their FTP's are small. There will be a gradient for which Basso and Simoni say are on an equal footing. Below that grade Basso does better, above it Simoni does better. Since Basso and Savoldelli are similar sizes they will struggle in similar ways on the really steep stuff with the stronger one winning out, but they will both be having a hard time compared to the guys who are 8kg lighter, i.e Di Luca, Simoni, Cunego.
Remember in the 2005 Giro, stage 11 Savoldelli scored time on Simoni and co mainly due to his descending skills I guess, having 20 seconds in hand before the climb then hanging on to Basso. But on stage 13 he gained time on Simoni and Di Luca on an uphill finish (7 seconds). So I reckon on the flatter climbs Savoldelli can outclimb Simoni and DiLuca and Cunego. But on the steeper climbs he gets shot out the back.
The only stage Savoldelli lost major time on was the Col de Finestre stage, more really hard stages this year so maybe he will have two stages where he gets hit badly.