We replaced the sails on our 38 Ocean over the last couple of years with new Doyle sails. We didn't go with exact replacement for two reasons: the first was Elstrom never responded to our requests for quote, the second was the aftermarket did.
We decided to modify the headsail slightly, which was a good idea. We didn't like the low cut clew blocking our forward view when it was tightly sheeted. Doyle was happy to improve our forward visibility - we are cruisers not racers - and there was no discernable loss in performance.