Years ago I raced the Great South Bay 60-60 against Glen Ashby and his crew on a 4.9. They were probably 340 lbs+ and kicked everyones sorry butts sailing on 20 fters. The 4.9 does fairly well with a load on.
I have sailed the 4.9 with about 350 lbs all up in 12-15 knots I thought it was much better sailing then a F-18 at the same crew weight and wind. Given the choice I would race it at around 310 lbs in most conditions. In 30 knots I think I would rather be on the f-18 though.

I don't own either boats personaly.

Cheers,
Eric