After doing some club comparing -
Yardage wise, I think the Top Level G20 woods will be pretty close to the R11s. The L58 G20 Driver is 12 yards short, but the 3 Wood and Hybrid are just 5 yards short of their equivalent R11s. I would reckon the L80something G20 woods will have about equal yardage to the R11s, and the Driver will be 275-280. They'll give em another half dot of P&F which would make them half a dot less in P and half a dot more in F than the R11s.
I noticed while comparing clubs that the G20s are somewhat mixed in trajectory - the woods and irons are High, but the Driver is Med/High. I never had the G10 Driver, was it Med/High?