When I lay my sail out flat, and then lay another sail (made for a different mast) on top of it, my sail has about 2" more luff curve.

Does anyone know the standard luff curve (is there such a thing?!) for modern sails for a Chipstow, a Seldon and a Superspar mast? 
Is it different for the D4 moulded sails, vs the 2 year old sails?

"Accurate" measurements are not needed - just a general impression of more or less curve.

And does one sailmaker (in general) make sails with more curve (or less curve) than another? E.g. Does P&B always cut their sails for more mast curve??

THANKS!

The new P&B D4 sails do have more luff round in than the std sail, so if you're using a D$ sail let the lowers off about 10mm to siut the sail.