Hi Chris,
To be honest, I think that the sail is a very small part of the speed equation...
Experience and ability is king, followed by board width, fin and tuning your equipment. Then comes rider weight, determination, and then I'd rank sail.
Then again, I'm not a fast sailor so take my advice with a good pinch of salt

As for comparing the Ezzy with other 2 cam sails, I haven't tried many other brands, but of the ones I've tried, it is far and away the best. This could also be partly because it rigs on skinnies, while most other cammed sails don't.
All I know is that with an adjustable outhaul system on this sail, I got a really amazing sweet spot where the sail feels comfortable. And if I can feel comfortable when sailing, this will make me sail longer and enjoy my day more. I'd definitely buy another one when the time comes to upgrade