I had a 16 for 5 years and have had my Getaway for 9 years now and LOVE it.
The 16 points much higher than the Getaway due to the shape of the hulls which can be very frustrating if you try to stay with them. Don't fall into that trap of pinching up - keep the boat moving fast but as close as you can.
If you compare the Portsmouth rating of 76.0 for the 16 to the rating of 83.1 for the Getaway, you can get a little idea of the inherent difference between the two. In a handicapped race if the Getaway is close enough to throw a rock at the 16 then the Getaway would win on corrected time.
I've raced in several regattas in my Getaway where there were 16's on the course and have finished ahead of them, especially when in light air.